Resident scanner won't turn on

Avast 4.8 home edition running on Vista Business. Install successful, but scanner spontaneously reverts back to “disabled”. Will the program be usable on Vista Business? If so, what do I have to do to make it so?

It should be fine on Vista Business.

Have (or did) you another Anti-Virus installed in this system, if so what was it and how did you get rid of it ?

What is reporting it is disabled ?
If the Vista Security Centre, then that could be wrong as it can be a bit flaky at times.

  • What avast processes are running in Task Manager, they begin with ash or asw, see image ?