I had installed Avast in my pd after disabling my existing norton.
it worked fine
I remove norton from my PC, and from then on I keep getting error messages about mshata.exe, and then the window closes.
I wanted to uninstall it and reinstall, but… when I go to the “install new sofware” window, I get the same error message.
Do you mean mshta.exe?
What OS?
What version of Avast?
What is the exact error?
Did you checked system and event log files?
Is there an error in the Avast log file(s)?
Did you use the uninstall util to remove Norton?
etc etc.
search for/remove any traces of Norton: Symantec-Link
→ choose the tool/manual removal instructions for your NAV-version and work through them:
NORTON can seriously trip up the system for any following AV’s