Hi, we have three computers. All are windows but different versions windows xp, vista and 7. If I install avast in windows7, can I also install avast in XP and vista using same license?
yes…
And as long as your license covers you for 3 PC’s 
Hi, we have three computers. All are windows but different versions windows xp, vista and 7. If I install avast in windows7, can I also install avast in XP and vista using same license?
yes…
And as long as your license covers you for 3 PC’s