Please help with a trojan Virus?

I have these programs on my Computer and AVAST is the ONLY ONE who Detects a Virus.

Avast Anti Virus

AdAware 2007

CCleaner

a-squared Free

Super Antispyware Professional

Windows Defender

Everyday 2 or 3 times a day, Avast tells me that I have a Trojan Virus, and other Malware, BUT the OTHER Programs I have listed does NOT Pick it up and tells me that my Computer is Running Normal and Nothing is Detected. It is a EXE Trojan File, and I have Contacted Avast about this, BUT all they tell me to do is what I have already done. I MOVE the Infected File into the Virus Chest, and sure enough a few hours later Avast Warnes me AGAIN with the SAME VIRUS WARNING. This has been going on for over 3 weeks and Avast IS NO HELP. ( the support team ) What must I do to get Rid of this Trojan IF it is NOT a False Postive, and IF it is a False Postive, how do I know it is? I Apologize for this being so long of a Question, BUT I do not know how to explain it better. Thanx

Please help with a trojan Virus?spyware removal

The infection is in your system restore points! This is a self replicating infection therefore it can reinstall itself! In order to rid yourself completely of this infection, disable your system restore, reboot, then reenable system restore. This will get rid of all of your restore points except for the most recent, however, this WILL get rid of the infection. After you reenable system restore run a scan with Avast! again and your computer should be clean. This will work 100% Guaranteed!