just one solution to disable Avast: uninstall !
I have problem with avast and utorrent; if I disable and kill all process;pb is same; just work 2days (before 1day)
Avast use process, but use drivers, that not displayed in taskmanager..
See Manage, and display hidden device, open drivers Not Plug'nPlay: aswrdr,avast! Network...,avast! Self...
You can test if you can restart your computer if this drivers is set to disable... if you know how to set to previous state, if you have bluescreen after reboot!