Ah...multiple threads , here's what I posted in your other thread.

Originally posted here by DjM
I am thinking coincidence here, the file you said you downloaded here: http://www.antionline.com/showthread...hreadid=257398 was the Antivirus product. AVG (avg.exe). Now Tedob1 downloaded the file right after you and scanned it. It was found to be virus free.

The fact that your system keeps restarting is a symptom of the Sasser worm making the rounds. You can find information on it HERE.

Have you applied the latest Microsoft patches? Are you running a firewall? If the answer is no to these questions, my guess is your infected with Sasser. Read the information in the link, it will tell you what to look for and how to clean up the mess.