[Wine] Source Crashing to Desktop

[japan1]

Whenever I try to load a source game, eg counter strike the loading bar will get to the end and say 'initialising game data' then it will freeze and crash back to the desktop. I've tried different versions of wine and ATI drivers but still the same issue. It did work on my older 7900gs but I've upgraded to an ATI 2900 card and I'm having this problem. Any help would be greatly appreciated thanks.

My spec if it helps:
E2160 @3GHz
2GB 800Mhz
ATI 2900GT
320GB HDD
Ubuntu 8.04