Problems Outdoors

First my laptop configuration

Asus A7V
Intel Pentium M 2ghz
1 Gb Ram
ATI Mobility Radeon X700

Hello, after finally managing to play the game decently (I have some problems with my Grahical Card, it has like specific drivers for Asus, made by Asus, as far as I understood from my web search...) Now somebody with more or less the same problem (not able to play the game) for another game had solved it by installing these drivers: http://ati.amd.com/online/mobilecatalyst/ Now that worked and even other games are benefitting from it! (But can somebody please confirm this? I got it from this dutch web board: http://gathering.tweakers.net/forum/...ssages/1171436 (second post))

Only when playing FF the moment I'm playing CZ2 or Shutdown, when I look to the sky or when I go outside. FF starts hanging... resulting in a full pc reset. (HL2 and CSS work perfectly alright, now and before I changed the drivers)

What could be wrong?
Thanks in advance...