just download Avast 5 yesterday, and after using a few minutes, there’s a pop out saying that ‘Avast! service stopped working and was closed’ after i click on ‘close’, it appear that Avast does not use system memory safely. Whats going on?? running on Window Vista SP 2… had tried enable it again but after awhile, same things goes again. and i had tried repair avast 5 but still no luck