After putting together a brand new Phenom-based system, I went to install
Vista Home Premium 64-bit. Just after typing in the product key, I get an
error that says "Exception Unknown Software Exception (0x40000015) at
location 0x776a1261" and it brings me back to the install screen.

After several attempts, I was able to get the install program to run, but
upon trying to boot in to Vista, it says the install failed and it could not
boot, so I tried to reinstall, and I never got the past the same error above.



Hardware:
Phenom 9600
DFI 790FX motherboard
4 gigs Corsair 2x2 DDR2 ram
500GB seagate 7200.11 hard drive
HIS Radeon x1900 XT
Creative Labs sound blaster Live! 24-bit

Complete system specs in sig:

I had the same issue and worked around it by putting a 2x cpu chip into the system, installing, doing the patchs, then putting the phenom in and doing the patched from amd.

Took a bit longer but it worked. Almost sorry I didnt go IBM quadcore, they have no such issues.