I tend to receive the following error message when I view the site in IE 9:

HTML1524: Invalid DOCTYPE. The shortest valid doctype is "<!DOCTYPE html>".
activate.html, line 1 character 1
SEC7113: CSS was ignored due to mime type mismatch
style.css

I include herewith the html code:

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml"><head>
<meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1" /><title>Untitled Document</title>

<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.4.2/jquery.min.js?ver=3.0.1">
</script>
<script type="text/javascript" src="js/activate.js">
</script>
<script type="text/javascript" src="js/img-rotator.js">
</script>
<link rel="stylesheet" href="css/style.css" type="text/css" media="screen" />
</head>
<body>
<center>
<table>
<tbody>
<tr>
<td colspan="2"> <img src="images/Complete-Banner.gif" height="251" width="1052" /></td>
</tr>
<tr>
<td class="top" width="251">
<table width="248">
<tbody>
<tr>
<td height="30">&nbsp;</td>
</tr>
<tr>
<td class="leftlinkbox" height="25" width="214"><a href="" class="leftlink">Home</a></td>
</tr>
<tr>
<td class="leftlinkbox" height="25"><a href="" class="leftlink">About Us</a></td>
</tr>
<tr>
<td class="leftlinkbox" height="25"><a href="" class="leftlink">Activate myiBox IPTV</a></td>
</tr>
<tr>
<td class="leftlinkbox" height="25"><a href="" class="leftlink">Annual Renewal myiBox IPTV</a></td>
</tr>
<tr>
<td class="leftlinkbox" height="25"><a href="" class="leftlink">Contact Us</a></td>
</tr>
<tr>
<td class="leftlinkbox" height="25"><a href="" class="leftlink">myiBox IPTV Channels</a></td>
</tr>
<tr>
<td class="leftlinkbox" height="25"><a href="" class="leftlink">myiBox IPTV User Guide</a></td>
</tr>
<tr>
<td class="leftlinkbox" height="25"><a href="" class="leftlink">myiBox IPTV FAQ</a></td>
</tr>
<tr>
<td class="leftlinkbox" height="25"><a href="" class="leftlink">myIBox IPTV - Wi-Fi Media
Player</a></td>
</tr>
<tr>
<td class="leftlinkbox" height="25"><a href="" class="leftlink">Distributor Detail</a></td>
</tr>
<tr>
<td height="118"></td>
</tr>
</tbody>
</table>
</td>
<td class="top" width="801">
<center>
<table width="780">
<tbody>
<tr>
<td height="30">
<form method="post" name="form">
<table border="0" cellpadding="2" cellspacing="2" width="748">
<tbody>
<tr>
<td height="30" width="369">&nbsp;</td>
<td width="369">&nbsp;</td>
</tr>
<tr>
<td class="wording">Your Full Name: <br />
<input class="textfield" size="47" id="name" name="name" /></td>
<td class="wording">City:<br />
<input class="textfield" size="47" id="city" name="city" /></td>
</tr>
<tr>
<td class="wording">Company Name: <br />
<input class="textfield" size="47" id="cmpName" name="cmpName" /></td>
<td class="wording">Postal /
Zip
Code: <br />
<input class="textfield" size="47" id="postal" name="postal" /></td>
</tr>
<tr>
<td class="wording">Your Email:<br />
<input class="textfield" size="47" id="email" name="email" /></td>
<td class="wording">Province /
State: <br />
<input class="textfield" size="47" id="province" name="province" /></td>
</tr>
<tr>
<td class="wording">Telephone:
(Please include
Country Code)<br />
<input class="textfield" size="47" id="tel" name="tel" /></td>
<td class="wording">Country: <br />
<select id="country" name="country"><option value="Afghanistan">Afghanistan</option><option value="Albania">Albania</option><option value="Algeria">Algeria</option><option value="American Samoa">American
Samoa</option><option value="Andorra">Andorra</option><option value="Angola">Angola</option><option value="Anguilla">Anguilla</option><option value="Antartica">Antarctica</option><option value="Antigua and Barbuda">Antigua
and
Barbuda</option><option value="Argentina">Argentina</option><option value="Armenia">Armenia</option><option value="Aruba">Aruba</option><option value="Australia">Australia</option><option value="Austria">Austria</option><option value="Azerbaijan">Azerbaijan</option><option value="Bahamas">Bahamas</option><option value="Bahrain">Bahrain</option><option value="Bangladesh">Bangladesh</option><option value="Barbados">Barbados</option><option value="Belarus">Belarus</option><option value="Belgium">Belgium</option><option value="Belize">Belize</option><option value="Benin">Benin</option><option value="Bermuda">Bermuda</option><option value="Bhutan">Bhutan</option><option value="Bolivia">Bolivia</option><option value="Bosnia and Herzegowina">Bosnia
and
Herzegowina</option><option value="Botswana">Botswana</option><option value="Bouvet Island">Bouvet
Island</option><option value="Brazil">Brazil</option><option value="British Indian Ocean Territory">British
Indian Ocean Territory</option><option value="Brunei Darussalam">Brunei
Darussalam</option><option value="Bulgaria">Bulgaria</option><option value="Burkina Faso">Burkina
Faso</option><option value="Burundi">Burundi</option><option value="Cambodia">Cambodia</option><option value="Cameroon">Cameroon</option><option value="Canada">Canada</option><option value="Cape Verde">Cape Verde</option><option value="Cayman Islands">Cayman
Islands</option><option value="Central African Republic">Central
African Republic</option><option value="Chad">Chad</option><option value="Chile">Chile</option><option value="China">China</option><option value="Christmas Island">Christmas
Island</option><option value="Cocos Islands">Cocos
(Keeling)
Islands</option><option value="Colombia">Colombia</option><option value="Comoros">Comoros</option><option value="Congo">Congo</option><option value="Congo">Congo, the
Democratic
Republic
of the</option><option value="Cook Islands">Cook
Islands</option><option value="Costa Rica">Costa Rica</option><option value="Cota D'Ivoire">Cote
d'Ivoire</option><option value="Croatia">Croatia
(Hrvatska)</option><option value="Cuba">Cuba</option><option value="Cyprus">Cyprus</option><option value="Czech Republic">Czech
Republic</option><option value="Denmark">Denmark</option><option value="Djibouti">Djibouti</option><option value="Dominica">Dominica</option><option value="Dominican Republic">Dominican
Republic</option><option value="East Timor">East Timor</option><option value="Ecuador">Ecuador</option><option value="Egypt">Egypt</option><option value="El Salvador">El Salvador</option><option value="Equatorial Guinea">Equatorial
Guinea</option><option value="Eritrea">Eritrea</option><option value="Estonia">Estonia</option><option value="Ethiopia">Ethiopia</option><option value="Falkland Islands">Falkland
Islands
(Malvinas)</option><option value="Faroe Islands">Faroe
Islands</option><option value="Fiji">Fiji</option><option value="Finland">Finland</option><option value="France">France</option><option value="France Metropolitan">France,
Metropolitan</option><option value="French Guiana">French
Guiana</option><option value="French Polynesia">French
Polynesia</option><option value="French Southern Territories">French
Southern Territories</option><option value="Gabon">Gabon</option><option value="Gambia">Gambia</option><option value="Georgia">Georgia</option><option value="Germany">Germany</option><option value="Ghana">Ghana</option><option value="Gibraltar">Gibraltar</option><option value="Greece">Greece</option><option value="Greenland">Greenland</option><option value="Grenada">Grenada</option><option value="Guadeloupe">Guadeloupe</option><option value="Guam">Guam</option><option value="Guatemala">Guatemala</option><option value="Guinea">Guinea</option><option value="Guinea-Bissau">Guinea-Bissau</option><option value="Guyana">Guyana</option><option value="Haiti">Haiti</option><option value="Heard and McDonald Islands">Heard
and
Mc Donald Islands</option><option value="Holy See">Holy See
(Vatican City
State)</option><option value="Honduras">Honduras</option><option value="Hong Kong">Hong Kong</option><option value="Hungary">Hungary</option><option value="Iceland">Iceland</option><option value="India">India</option><option value="Indonesia">Indonesia</option><option value="Iran">Iran (Islamic
Republic of)</option><option value="Iraq">Iraq</option><option value="Ireland">Ireland</option><option value="Israel">Israel</option><option value="Italy">Italy</option><option value="Jamaica">Jamaica</option><option value="Japan">Japan</option><option value="Jordan">Jordan</option><option value="Kazakhstan">Kazakhstan</option><option value="Kenya">Kenya</option><option value="Kiribati">Kiribati</option><option value="Democratic People's Republic of Korea">Korea,
Democratic People's Republic of</option><option value="Korea">Korea, Republic
of</option><option value="Kuwait">Kuwait</option><option value="Kyrgyzstan">Kyrgyzstan</option><option value="Lao">Lao People's
Democratic
Republic</option><option value="Latvia">Latvia</option><option value="Lebanon" selected="selected">Lebanon</option><option value="Lesotho">Lesotho</option><option value="Liberia">Liberia</option><option value="Libyan Arab Jamahiriya">Libyan
Arab
Jamahiriya</option><option value="Liechtenstein">Liechtenstein</option><option value="Lithuania">Lithuania</option><option value="Luxembourg">Luxembourg</option><option value="Macau">Macau</option><option value="Macedonia">Macedonia,
The Former
Yugoslav Republic of</option><option value="Madagascar">Madagascar</option><option value="Malawi">Malawi</option><option value="Malaysia">Malaysia</option><option value="Maldives">Maldives</option><option value="Mali">Mali</option><option value="Malta">Malta</option><option value="Marshall Islands">Marshall
Islands</option><option value="Martinique">Martinique</option><option value="Mauritania">Mauritania</option><option value="Mauritius">Mauritius</option><option value="Mayotte">Mayotte</option><option value="Mexico">Mexico</option><option value="Micronesia">Micronesia,
Federated
States of</option><option value="Moldova">Moldova,
Republic of</option><option value="Monaco">Monaco</option><option value="Mongolia">Mongolia</option><option value="Montserrat">Montserrat</option><option value="Morocco">Morocco</option><option value="Mozambique">Mozambique</option><option value="Myanmar">Myanmar</option><option value="Namibia">Namibia</option><option value="Nauru">Nauru</option><option value="Nepal">Nepal</option><option value="Netherlands">Netherlands</option><option value="Netherlands Antilles">Netherlands
Antilles</option><option value="New Caledonia">New
Caledonia</option><option value="New Zealand">New Zealand</option><option value="Nicaragua">Nicaragua</option><option value="Niger">Niger</option><option value="Nigeria">Nigeria</option><option value="Niue">Niue</option><option value="Norfolk Island">Norfolk
Island</option><option value="Northern Mariana Islands">Northern
Mariana Islands</option><option value="Norway">Norway</option><option value="Oman">Oman</option><option value="Pakistan">Pakistan</option><option value="Palau">Palau</option><option value="Panama">Panama</option><option value="Papua New Guinea">Papua
New Guinea</option><option value="Paraguay">Paraguay</option><option value="Peru">Peru</option><option value="Philippines">Philippines</option><option value="Pitcairn">Pitcairn</option><option value="Poland">Poland</option><option value="Portugal">Portugal</option><option value="Puerto Rico">Puerto Rico</option><option value="Qatar">Qatar</option><option value="Reunion">Reunion</option><option value="Romania">Romania</option><option value="Russia">Russian
Federation</option><option value="Rwanda">Rwanda</option><option value="Saint Kitts and Nevis">Saint
Kitts
and Nevis</option><option value="Saint LUCIA">Saint LUCIA</option><option value="Saint Vincent">Saint
Vincent and
the
Grenadines</option><option value="Samoa">Samoa</option><option value="San Marino">San Marino</option><option value="Sao Tome and Principe">Sao
Tome and
Principe</option><option value="Saudi Arabia">Saudi
Arabia</option><option value="Senegal">Senegal</option><option value="Seychelles">Seychelles</option><option value="Sierra">Sierra Leone</option><option value="Singapore">Singapore</option><option value="Slovakia">Slovakia
(Slovak Republic)</option><option value="Slovenia">Slovenia</option><option value="Solomon Islands">Solomon
Islands</option><option value="Somalia">Somalia</option><option value="South Africa">South
Africa</option><option value="South Georgia">South
Georgia and
the
South Sandwich Islands</option><option value="Span">Spain</option><option value="SriLanka">Sri Lanka</option><option value="St. Helena">St. Helena</option><option value="St. Pierre and Miguelon">St.
Pierre
and Miquelon</option><option value="Sudan">Sudan</option><option value="Suriname">Suriname</option><option value="Svalbard">Svalbard and
Jan Mayen
Islands</option><option value="Swaziland">Swaziland</option><option value="Sweden">Sweden</option><option value="Switzerland">Switzerland</option><option value="Syria">Syrian Arab
Republic</option><option value="Taiwan">Taiwan,
Province of China</option><option value="Tajikistan">Tajikistan</option><option value="Tanzania">Tanzania,
United Republic
of</option><option value="Thailand">Thailand</option><option value="Togo">Togo</option><option value="Tokelau">Tokelau</option><option value="Tonga">Tonga</option><option value="Trinidad and Tobago">Trinidad
and
Tobago</option><option value="Tunisia">Tunisia</option><option value="Turkey">Turkey</option><option value="Turkmenistan">Turkmenistan</option><option value="Turks and Caicos">Turks
and Caicos
Islands</option><option value="Tuvalu">Tuvalu</option><option value="Uganda">Uganda</option><option value="Ukraine">Ukraine</option><option value="United Arab Emirates">United
Arab
Emirates</option><option value="United Kingdom">United
Kingdom</option><option value="United States">United
States</option><option value="United States Minor Outlying Islands">United
States Minor Outlying Islands</option><option value="Uruguay">Uruguay</option><option value="Uzbekistan">Uzbekistan</option><option value="Vanuatu">Vanuatu</option><option value="Venezuela">Venezuela</option><option value="Vietnam">Viet Nam</option><option value="Virgin Islands (British)">Virgin
Islands (British)</option><option value="Virgin Islands (U.S)">Virgin
Islands
(U.S.)</option><option value="Wallis and Futana Islands">Wallis
and
Futuna Islands</option><option value="Western Sahara">Western
Sahara</option><option value="Yemen">Yemen</option><option value="Yugoslavia">Yugoslavia</option><option value="Zambia">Zambia</option><option value="Zimbabwe">Zimbabwe</option></select>
</td>
</tr>
<tr>
<td class="wording">Mobile
Phone: <br />
<input class="textfield" size="47" id="mobile" name="mobile" /></td>
<td class="wording">my iBOX
IPTV
Serial Number:<br />
<input class="textfield" size="47" id="serialNo" name="serialNo" /></td>
</tr>
<tr>
<td class="wording">Street
Address Line 1:<br />
<input class="textfield" size="47" id="address1" name="address1" /></td>
<td class="wording">Active my
iBox IPTV <input class="textfield" id="agree" name="agree" type="checkbox" /></td>
</tr>
<tr>
<td class="wording">Street
Address Line 2:<br />
<input class="textfield" size="47" id="address2" name="address2" /></td>
<td>
<div><input value="Submit" class="submit" type="submit" /><span class="error" style="display: none;"> Please Enter
Valid Info</span>
<span class="success" style="display: none;">Registration
Successfully</span></div>
</td>
</tr>
<tr>
<td></td>
<td>&nbsp;</td>
</tr>
<tr>
<td></td>
<td>&nbsp;</td>
</tr>
<tr>
<td colspan="2"></td>
</tr>
<tr>
<td colspan="2"></td>
</tr>
<tr>
<td colspan="2"></td>
</tr>
</tbody>
</table>
</form>
</td>
</tr>
<tr>
<td>
</td>
</tr>
</tbody>
</table>
</center>
</td>
</tr>
<tr>
<td colspan="2"></td>
</tr>
<tr>
<td>&nbsp;</td>
<td>&nbsp;</td>
</tr>
<tr>
<td colspan="2">
<hr align="center" color="#cc0000" size="1" /></td>
</tr>
<tr>
<td colspan="2">
<center>
<table width="648">
<tbody>
<tr>
<td width="26">&nbsp;</td>
<td width="145"><a href="" class="bottomlink"><img src="images/arrow.jpg" border="0" height="10" width="16" />Home</a></td>
<td width="30">&nbsp;</td>
<td width="163"><a href="" class="bottomlink"><img src="images/arrow.jpg" border="0" height="10" width="16" />Contact Us</a></td>
<td width="30">&nbsp;</td>
<td width="226"><a href="" class="bottomlink"><img src="images/arrow.jpg" border="0" height="10" width="16" />myiBox
IPTV FAQ</a></td>
</tr>
<tr>
<td>&nbsp;</td>
<td><a href="" class="bottomlink"><img src="images/arrow.jpg" border="0" height="10" width="16" />About
Us</a></td>
<td>&nbsp;</td>
<td><a href="" class="bottomlink"><img src="images/arrow.jpg" border="0" height="10" width="16" />myiBox
IPTV Channels</a></td>
<td>&nbsp;</td>
<td><a href="" class="bottomlink"><img src="images/arrow.jpg" border="0" height="10" width="16" />myIBox
IPTV - Wi-Fi Media Player</a></td>
</tr>
<tr>
<td>&nbsp;</td>
<td><a href="" class="bottomlink"><img src="images/arrow.jpg" border="0" height="10" width="16" />Activate
myiBox IPTV</a></td>
<td>&nbsp;</td>
<td><a href="" class="bottomlink"><img src="images/arrow.jpg" border="0" height="10" width="16" />myiBox
IPTV User Guide</a></td>
<td>&nbsp;</td>
<td><a href="" class="bottomlink"><img src="images/arrow.jpg" border="0" height="10" width="16" />Distributor
Detail</a></td>
</tr>
</tbody>
</table>
</center>
</td>
</tr>
<tr>
<td colspan="2"></td>
</tr>
<tr>
<td>&nbsp;</td>
<td>&nbsp;</td>
</tr>
</tbody>
</table>
</center>
</body></html>

Did I miss something? Your help is kindly appreciated.

Thank You.

the most likely cause is IE, try a better validator, like http://validator.w3.org/check apart from messy code, hard to read, there doesnt seem much wrong

Its a 'soft warning' :: nothing to be really concerned about, - yet:
You are using a wrong doctype ( xhtml ) on a plain HTML document!
That's wrong [!] because you are missleading your current clients and also the Servers answering those requests.

But there is no harm [...] exept for
few extra (wasted) bytes on content transport, like..., 'over and over again'.

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