Virus Protection Not Found

Installed Avast 4 Home Edition. The blue ball is working but got message from Windows Security Center that says Virus Protection Not Found. Is the Anti-virus working? When I did a scan there were several files that Avast was unable to scan. What happened?

  • What version of Avast? (4.1 or 4.5)
  • Did you uninstalled any other av that was on the system completely?

Are you using a fresh new installation of XP and SP2?
If so, you must try the 4.5 Beta to get rid of this.