i845pe + ati-drivers = problem

Everytime that I run X and execute an aplication that uses hardware acel. like glxgears ..my Xfree Crash!.. my comp fronzen... and I've got to reset it. I've been reading a lot. but nothing seems to work for me .Is there anu issue related to the i845pe AGP?
My specs
Asus p4pe
p4 2.4B 512(ram)
ATI AIW9800 PRo
XFree 4.3 + ati-drivers 3.9.0
kernel-2.4.22
THX

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