Problem on Visual Web Developer

[ebabes]

I had finished my website using Visual Web Developer and when i put it in the local
IIS and make request to the site, an error displayed in the browser like this

The XML page cannot be displayed
Cannot view XML input using XSL style sheet. Please correct the error and
then click the Refresh button, or try again later.

--------------------------------------------------------------------------------

A name was started with an invalid character. Error processing resource
'http://localhost/mySite/Default.aspx'. Line 1, Po...

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs"
Inherits="_Default" %>
-^

and also the web service make the same error
please help what can i do??