Am back, I really never left.I still used Avast on XP and vista,but my windows 8 was another story,it turns out I had memory problems.They never found out the problem and since it was a new pc they gave me another.Got it home the next day the memory sticks fried to a crispy lump.Back to the shop for another new PC. So far so good with avast installed and working good.By the way all 3 PC are ASUS.