SciTech GLDirect

Since I have SciTech GLDirect run the games but they run only with 10-13 fps or so.
befor i installed win xp the games run without SciTech GLDirect
my system:
Amd k6/2 550 mhz
192 MB SDRAM
Terratec Sixpack 5.1
Terratec Tv+
Aopen Geforce 2 MX 400
Allied Telesyn Network card
Asus P5a-b mainbord