Have you tried, since your last efforts with Avast, to uninstall the faulty Apps, and then to reinstall them and retest?
For testing purposes disable Windows Defender Real Time scanning. See what that does. Also have another look at the Clean Boot procedure concentrating on third party programs and services.
How to perform a clean boot to troubleshoot a problem in Windows Vista, Windows 7, or Windows 8
http://support.microsoft.com/default.aspx/kb/929135
See if these are an option for you to consider. Windows 8 includes these built in options.
How to restore, refresh, or reset your PC
http://windows.microsoft.com/en-US/windows-8/restore-refresh-reset-pc