virus scans don't work due to failed IOCTL call made by the app being incorrect

subject says it all. hopefully not a bug, virus, or malware problem. please advise.

Where are the details like :

  • What exact OS/SP ?
  • What exact version of avast ?
  • Is there any other security (related) software installed ? (or was there)
  • Already performed a repair of avast ?
  • Already performed a clean installation of avast ?
    etc.