I get precisely the same error when I run ALL tests. The test always crashes on one of the CPU tests. Especially the prime number test.
I should note that I don't get the error every time I run ALL tests. Perhaps half the time. But, the error message is always the 0x7c91084b and the 0x00030ffc, as the previous posters.
My system is brand new. Out of the box only 3 days ago. All premium parts and it burned in perfect for days in the shop. I can assure you nothing is wrong with the hardware, and so far this software is the only thing to crash.
My system uses the Athlon 4400 X2 dual core chip. You can see the rest in my signature.
AMD Athlon 4400 X2 dual core
2GB DDR Kingston RAM
ASUS A8N32-SLI Deluxe mobo
4 x WDC 320GB SATA2 drives
Sony DRU-820A DVD
2 x Gigabit ports