Spybot is not the greatest tool to run with avast these days especially the immunize part as its known to cause problems with avast, you also will want to run the McAfee uninstall tool from here http://thewebatom.net/uninstallers/security-software/ number 21a in the list to get rid of any leftovers, reboot after running tool then do a repair of avast.
DavidR’s link will give the same tool.