I had the same problem. Thought it was last nights storm, but then other things started crashing. A system restore completely wrecked Avast. It would not accept my license file.

I used Avastclear to remove the mess.
Then re-installed and all is now working
EXCEPT I wanted to remote to another users PC (he has AIS issues) and find that unless he has Premier (whatever that is) he cannot request Remote Assistance any more.
Pah! :stuck_out_tongue: