Win32:Malware-gen HELP

Hi There, I Was Wondering Is Someone Could Help Me with this Virus I Have. Avast! keeps popping up with virus block notifications saying its Win32:Malware-gen and Win32:Downloader-PKU [Trj]. I’m Not Sure What to Do I’ve Scanned My Computer But Nothing, Please HELP!!!

Please attach your logs.
http://forum.avast.com/index.php?topic=53253.0