About 10 days ago, my HD died. New HD installed, Win XP-SP3 and all device drivers installed. Next, installed Avast. Installation seemed to go fine, but I cannot update the defintions; get error “Last encountered error. Invalid signature. Setup will terminate.” Also get periodic, red alerts telling me that the last update attempt failed. I have tried repairing, tried uninstalling/reinstalling. . . nothing changes.
What’s wrong?