The only other thing I can think of are, what other security applications do you have installed ?
Have (or did) you another Anti-Virus installed in this system, if so what was it and how did you get rid of it ?
If they don't work:
Try a repair of avast. Add Remove programs, select 'avast! Anti-Virus,' click the Change/Remove button and scroll down to Repair, click next and follow. This has in the past resolved this out of sync issue between reported and actual VPS version.
If that doesn't work try, uninstall, reboot, install, reboot.