ok thx.. do you know anything about the game Street Legal, if i can play that with my voodoo 3 2000?? so my only option is to buy a new video card? yeah but won't i have this problems in the future too..??????

Difficult question.

With the large amount of limiting factors and Driver/Game Engine quirrels, this is really up to Trial&Error when using new Games.

First off all, you have to find out if the Game uses 3D Features that the Voodoo3 does not support. If so, try 3D Analyzer to workaround.

If not, the only thing you can do, is to use the List of available Drivers, from latest to old backwards.
Make sure you disable any advanced Tweaks before testing (e.g. Geometry Assist, Triple Buffering and the like)

Finally, make sure the Game is setup on absolute minimum Detail settings (also try to locate an .ini File, where the Game keeps all Settings, and look for further Options to disable, if the Game does not allow to set those from the in-game Preferences Menu).