As bash said really... Download and save these, then start your comp in safe mode, run ccleaner to clear your temp files, install malware bytes and update the definition rules by copying the rules.ref to the malware bytes folder (overwriting the current rules.ref) to here:
2000/XP: "C:\Documents and Settings\All Users\Application Data\Malwarebytes\Malwarebytes' Anti-Malware"
Vista/7: "C:\Users\All Users\Malwarebytes\Malwarebytes' Anti-Malware"
http://download.adriandaz.co.uk/mb/ccleaner.exe (stand alone ccleaner to clear out temporary files)
http://download.adriandaz.co.uk/mb/mbam-setup.exe (malware bytes)
http://download.adriandaz.co.uk/mb/rules.ref (latest rules as of 9:45am 2/7/10)
http://download.adriandaz.co.uk/mb/startup.exe (tool for showing and editing which programs load when your computer starts)