G400 MAX & HalfLife

[Reing]

Why i get only fps 20-30 in CounterStrike when i use my G400 MAX ?
I have 5.52drivers and 1.30TGL. Im using AMD AGP Miniport 4.61 drivers.

Comp is:
Athlon 800MHz
MSI K7Pro
256mb RAM
Matrox G400 MAX
Aureal SQ1500