Help Please

I’ve been dealing with this very annoying virus that could possibly be corrupting my system. I’ve searched for ways & even contacted a professional to help removed the virus to no avail. I will very appreciative if anyone at all can help; step-by-step instructions are preferred.

Also avast file system shield continually blocks both Win32:Malware-gen & Win 32:Downloader-PKU [Trj] every 4-8 minutes.

follow this guide and attach (not copy and paste) logs from malwarebytes / OTL / aswMBR
http://forum.avast.com/index.php?topic=53253.0