Pondus
4
what AV did you have before you installed avast! ?
have you run a removal tool to clear all leftovers after the uninstall ?
Uninstallers for Security Software - run and reboot
http://thewebatom.net/uninstallers/security-software/
have you tried a new clean avast install ?
http://www.avast.com/en-no/uninstall-utility