hi!
recently I got infected with a virus named win32/virut

I probably received it through an infected Indesign-torrent, as my virus scan prompted me that I had 70 virus infections as soon as I opened Indesign..
The virus scanner I had at that time was Avira Antivirus, but the virus spread way faster than the scanner, so eventually my whole pc (almost every .exe file) got infected and there was not much more I could do than to reformat my pc. Didn't lose any files because I have a flash drive. After that I used a program from AVG which was specifically designed to destroy win32/virut.
Well the problem is, my PC SEEMS to be clean, multiple virus scans confirm this. BUT my avira (reinstalled it) keeps giving me prompts sometimes that the win32/virut has infected a file. It doesn't seem to do much, but I want it to be completely removed from my computer. I have an idea of how the virus could have survived the reformatting: I used two small USB-drives during the time my PC got infected so they may have been infected too. Antivirus scans say that they are also clean now.
But still, my PC keeps giving me prompts sometimes about the win32/virut being detected!! Also, it seems like it is running a bit slower than it used to..
Can anyone tell me what to do?
**sorry for the long post and the bad English, it is not my native language

**