@Vile: Thanks
@Havlat: The reason I ask is because a Hard Drive will USUALLY not cause a crash after a few minutes. If you had a HDD problem, it would most likely not boot up at all. If it's crashing after running for a few minutes, that sounds more like a cooling or PSU issue, possibly even a driver issue. I would check your CPU/GPU/Mobo Chipset/PSU temperatures and make sure that all of your fans are operating.