Have you tried a boot time scan with avast!? Right click the scanner screen, select 'schedule a boot time scan' and reboot when requested.
Try the usual free adware/spyware scanners.
Ad-Aware FreeSpybot Search & DestroySUPERAntiSpyware FreeMalwarebytes' Anti-MalwareDownload, install and update the programs. Disconnect from the internet (pull the plug) before running scans in
Safe Mode if possible.
Always select the option to quarantine any malware found rather than delete it, then you will be able to restore files or registry entries wrongly identified as malware- a rare but not unknown event for any malware scanner.
If still having problems,
post a HijackThis! log.
