Try this guide:
http://forums.majorgeeks.com/showthread.php?t=35407
If combo fix says you have virut, re-format your computer. In my experience there is no sure way to completely rid your computer of this virus.
After the guide is complete, scan with panda anti-virus pro 2010 not the shareware version, and NoAdware if you can get them.
Restart
Take a look for any unfamiliar programs running with System Internals Process Explorer,
If you can't remove them, google it.
Uninstall all anti-malware/ anti-virus software.
run autoruns.
Un-check any unnecessary software
reboot
install AVG
Update, Run an advanced full system scan, un-check scan only infect-able files.
I work for a computer repair shop, i use this method when re-installation is a problem. It will get rid of 99% of malware.