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I tried the procedure given by essexboy, but avast still is not working. I uninstalled avast and installed avira, because it works fine on 8.1. Hopefully this is fixed soon so that I can switch back to avast.
after running the avast uninstall utility in safe mode, stay in safe mode, do not restart yet. install avast 2014 while still in safe mode, wait until the avast window opens after the install, then reboot into normal windows.
This worked for me1. Download uninstall utility from Avast website here http://www.avast.com/uninstall-utility2. Download whichever Avast program you are going to use.3. Run the uninstall utility4. When it asks whether you want to go to Safe mode SAY YES!5. Once in safe mode follow instructions but DO NOT RESTART!6. Run you Avast program (mine said that scan utility would run but I didn't see it)7. Reboot into normal mode8. VOILA Avast will be working.