Hi and welcome to the Daniweb forums

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You need to get service pack 1 for Vista so go to Windows Update and get all security patches.
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Can you please do the following.
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Scan with
HijackThis and then place a check next to all the following, if present:
R0 - HKLM\Software\Microsoft\Internet Explorer\Search,SearchAssistant =
R0 - HKLM\Software\Microsoft\Internet Explorer\Search,CustomizeSearch =
R0 - HKCU\Software\Microsoft\Internet Explorer\Toolbar,LinksFolderName =
O1 - Hosts: ::1 localhost
O2 - BHO: {0a9443a8-6e48-cba9-5804-5d111bb89b22} - {22b98bb1-11d5-4085-9abc-84e68a3449a0} - C:\Windows\system32\doracffr.dll (file missing)
O2 - BHO: (no name) - {56962429-3BAB-4CC8-98FF-801448E3A8D2} - C:\Windows\system32\hgGwTNeb.dll (file missing)
O2 - BHO: QXK Olive - {5AB14FEE-E161-455B-9A60-91AE848F8FA0} - C:\Windows\nldfmtapefs.dll (file missing)
O2 - BHO: (no name) - {BD962BAB-F429-460F-805B-B137087AB623} - C:\Windows\system32\ssqRJdBs.dll (file missing)
O3 - Toolbar: gktxaspm - {2890C98D-5959-4A94-A6C2-C59E85462152} - C:\Windows\gktxaspm.dll (file missing)
O13 - Gopher Prefix:
O21 - SSODL: pxgdslro - {73A16920-6B34-496C-BA6A-E10ADB76C35E} - C:\Windows\pxgdslro.dll (file missing)
O21 - SSODL: gnowmebk - {F78E80D3-F97B-4F03-868C-76236705EE80} - C:\Windows\gnowmebk.dll (file missing)
Now, close
all instances of Internet Explorer and any other windows you have open except
HiJackThis, click "
Fix checked".
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Download
Malwarebytes' Anti-Malware (
http://www.majorgeeks.com/Malwarebyt...are_d5756.html) to your desktop.
* Double-click
mbam-setup.exe and follow the prompts to install the program.
* At the end, be sure to checkmark the
Update Malwarebytes' Anti-Malware and
Launch Malwarebytes' Anti-Malware, then click
Finish.
* If an update is found, it will download and install the latest version.
* Once the program has loaded, select
Perform full scan, then click
Scan.
* When the scan is complete, click OK, then
Show Results to view the results.
* Be sure that everything is checked, and click
Remove Selected.
* When completed, a log will open in Notepad.
*
Post the log back here.
Make sure that you restart the computer.
The log can also be found here:
C:\Documents and Settings\Username\Application Data\Malwarebytes\Malwarebytes' Anti-Malware\Logs\
log-date.txt
Or at C:\Program Files\Malwarebytes' Anti-Malware\Logs\
log-date.txt
Post new HJT log.