Do you have virus in your system?

when your antivirus not detact this virus then contact your system admin he will solve this problem

i dont have any virus in my system because i use Avg antivirus...

Virtually None. I use NOD32.

try installing NOD32 would kill your virus

Please check if your anti virus definition is updated. Make sure to have it likely to insure detections from any current viruses. I used to have McAfee Antivirus better than Norton. There are lots of viruses that McAfee can detect unlike the latter. After you install it, keep on updating virus definitions.