pb au lancement des jeux sims 2 et star wars knight of the old republic

Bonjour, je viens d'acheter les Sims 2. J'avais precedemment achete Star Wars, Knight of the old republic et j'avais constate le meme probleme : quand je lance le jeu, au bout de 5 min, tout buggue! D'ou cela peut-il venir? Je crois pourtant remplir les conditions de la configuration minimale, qui sont :

If you have a T&L capable video card with at least 32 MB of video RAM then you need at least:

* 800 MHz processor or better
* 256 MB RAM if Windows XP, Windows ME, Windows 98 or Windows 2000
* At least 3.5 GB of hard drive space

If you have a non-T&L capable video card (an Intel Extreme Graphics or a Radeon 7000/VE Series) then you need at least:

* 2.0 GHz processor or better
* 256 MB RAM if Windows XP, Windows ME, Windows 98, or Windows 2000
* At least 3.5 GB of hard drive space

Supported video cards (and the more video memory the better):

* ATI RadeonTM series (7000 or better)
o Radeon 7000/VE series (non-T&L; requires 2.0 GHz processor)
o 7200, 7500
o 8500, All-In-Wonder 8500
o 9000, 9200, 9500, 9600, 9700, 9800
o X300, X600, X800

* Nvidia® QuadroTM series
o Quadro, Quadro2, Quadro4

* Nvidia® Geforce series (GeForce2 and better)
o GeForce2
o GeForce3, 3 Ti
o GeForce4, 4Ti, MX 420, 440
o GeForce FX 5200, 5600, 5700, 5800, 5900, 5950
o GeForce 6600, 6800

* Intel® Extreme Graphics (non-T&L; requires 2.0 GHz processor)
o 82845, 82865, 82915

J'ai une carte video ati radeon 9000, une carte mere ASUS a7n8x-x...