I'm posting this because after a ton of research done on many forums, and trying almost every suggestion found on this issue I concluded that on Acer Aspire 8935G non of them work. Tried reinstalling the OS thinking that perhaps a fresh system might solve the issue. Even tried the weirdest of ideas, like expanding atikmdag.sy_ and replacing the one in System32/drivers/... In most cases I got a BSOD blaming atikmdag.sys Alien9, posted some versions of his/her drivers which proved the most stable (lasting like 1 hour without a BSOD). Till now I considered myself a person who knows how things work with driver installations, but hey, was I wrong. Please help!