@bikemanAMD, what are crash details? I noticed Win8.1 is not showing the detailed crash information - I had to go to Admin Tools/Event Viewer. I am seeing failures in combase.dll (I recall the error was 0x00000005). I had no problems for the first 5 days of running avast! Pro 2014 and Win8.1. I started getting crashes after installing the Google Search add-on and also Google Toolbar, although uninstalled these did not seem to help. I am working with avast! on a problem related to IE and automatic configuration scripts that seemed Win7 specific. Disabling this feature cut the number of crashes dramatically on Win8.1 but they still pop up periodically. When I get through the list of more serious problems, I will take a closer look.