Run hijackthis. Hit None of the above, Click Do a System Scan Only. Put a Check in the box on the left side on these:
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Default_Search_URL = http://www.microsoft.com/isapi/redir.dl ... r=iesearch
R1 - HKLM\Software\Microsoft\Internet Explorer\Main,Search Page = http://www.microsoft.com/isapi/redir.dl ... r=iesearch
O2 - BHO: (no name) - {06849E9F-C8D7-4D59-B87D-784B7D6BE0B3} - (no file)
Close ALL windows and browsers except HijackThis and click "Fix checked"
1. Open My Computer
2. Right click on your hard drive that you wish to clean (C drive, for example)
3. In the context menu that opens, select properties
4. Under the general tab you should select Disk Cleanup
5. Windows will scan your drive which will take a few seconds/minutes
6. A box will display the various files you can remove.
Check all boxes except compress old files (If listed)
7. Click OK and windows will comply.
Restart your computer.
Reboot and "copy/paste" a new log file into this thread.
Also please describe how your computer behaves at the moment.