KBAP Demo Crash Issue

[wurenben]

I've downloaded the demo of KBAP(English Version) and tried it.But within half hour I crashed two times, both of them are critical so I must reset the computer. I bought
KBTL before and I like it very much (especially the music), although it crashes seldom. But it never happened before crashing 2 times in 30 minutes. One appears when combating enemies, the other one comes on map-walking.

My computer information
(working fine with Dragon Age Origings,NBA 2k10)

CPU:AMD 550@ quad core (oc 3.5g)
RAM: PDP ddr 800 2g x2 (oc 900)
MB:Gigabyte MA790GP-UD4H
VGA:MSI N260GTX Lightning
VGA Driver:Nvidia WHQL 190.62
OS: Vista x64 SP2