I just use the option from the tray icon that disables all shields.
Currently avast is not installed and I don't see anything left behind(drivers)...I check with the program autoruns
You are not going to be able to see these deep-level drivers left behind by uninstalling avast! Which is precisely the point, as they are high-security devices and hidden from view for a reason.
If you run aswclear.exe in Safe Mode, then all remaining drivers will be removed. Run aswclear.exe for all versions of avast! you have ever had on your system. Reboot after each version is removed, beginning with the newest to the oldest. So, if you have run 4.8, 5.0, 6.0, 7.0, then you would begin with 7.0, aswclear.exe in Safe Mode, reboot, then 6.0, aswclear.exe in Safe Mode, reboot, 5.0, aswclear in Safe Mode, reboot, and finally 4.8, aswclear in Safe Mode, reboot. aswclear.exe
must only be placed on the desktop before beginning.
Once that is done, all remaining drivers for all versions have been removed. Just be sure to point aswclear.exe only to the Avast folder only every time
(ALWIL folder for earlier versions) or you will remove something else you do not want.
Use
http://singularlabs.com/uninstallers/security-software/ to completely remove deep-level drivers left behind by any other a/v programs you have run and then uninstalled in the past.