found AUTORUN.INF AGAIN AND AGAIN

hi 2 all,
I am using avast home edition, when I insert USB flash drive avast found virus.
I have to delete it but after some seconds it has found again, I have done all the treatment i.e “move to chest” and press “no action” button also but I have found use less for me.
please somebody help what to do for that kind of problem?
thanks

Do make HJT to now what is the application currently running generated the autorun.inf…
If can, please provide details in the autorun.inf file…

I suggest:

  1. Clean your temporary files.
  2. Schedule a boot time scanning with avast with archive scanning turned on. If avast does not detect it, you can try DrWeb CureIT! instead.
  3. Use SUPERantispyware, MBAM or Spyware Terminator to scan for spywares and trojans. If any infection is detected, better and safer is send the file to Quarantine than to simple delete them.
  4. Test your machine with anti-rootkit applications. I suggest avast! antirootkit or Trend Micro RootkitBuster.
  5. Make a HijackThis log to post here or this analysis site. Or even submit the RunScanner log to to on-line analysis.
  6. Disable System Restore and then reenable it again.
  7. Immunize your system with SpywareBlaster.
  8. Check if you have insecure applications with Secunia Software Inspector.

Let your USB drive plugged and run Autorun Eater or Flash Disinfector, allowing them to clean up all drives. They would create hidden folders named autorun.inf in each partition and every USB drive plugged in when you ran it. These folders protect your drives from future infection. After that, reboot your computer.