system
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I would, check in Start>Search and search for any previous firewalls or any other Antiviruses your computer may have originally come with also search for Old Avast versions like 4.8 and 5 and delete their folders…Than go to Regedit and go to ‘edit’ ‘find’ and write in (example) ‘Noton’ and click ‘find’ than Norton ‘Find next’ again and again untiit it doesn’t find any registry issues of (Example) Norton… than do the same for say Avast 4.8 …Than I would do a clean install of Avast 6…Also if you do find any reminants of old firewalls or Antiviruses, download their clean up tool, but do the registry check even after them…luck and let me know how it goes…Ohh if you don’t feel safe working with your registry than don’t do this…