Random freezes then PC restarts; AMD CPU

Hey all, for the past few days I've been having a strange issue where my computer would lock up for a few seconds, and then restart. When I get back to my desktop, it says that the error was a BlueScreen (though I never see a blue screen). My last minidump file (which has vanished after I opened it in WinDbg) gave me this: FAILURE_BUCKET_ID: X64_0x124_AuthenticAMD_PROCESSOR_BUS_PRV, but I can't make any sense of it. Any help? My CPU is an AMD Phenom II X4 955 BE. This usually seems to only happen whenever I'm running Firefox, either alone, or with other programs.

EDIT: Memory diagnostic shows up clean and sfc /scannow shows no errors on either my SSD or HDD. CPU temps are fine as well, no overheating. I haven't overclocked it, either.

EDIT 2: Happened again. Here's the dump:

WHEA_UNCORRECTABLE_ERROR (124)
A fatal hardware error has occurred. Parameter 1 identifies the type of error
source that reported the error. Parameter 2 holds the address of the
WHEA_ERROR_RECORD structure that describes the error conditon.
Arguments:
Arg1: 0000000000000000, Machine Check Exception
Arg2: fffffa80079d88f8, Address of the WHEA_ERROR_RECORD structure.
Arg3: 0000000000000000, High order 32-bits of the MCi_STATUS value.
Arg4: 0000000000000000, Low order 32-bits of the MCi_STATUS value.

Debugging Details:
------------------


BUGCHECK_STR: 0x124_AuthenticAMD

CUSTOMER_CRASH_COUNT: 1

DEFAULT_BUCKET_ID: WIN7_DRIVER_FAULT

PROCESS_NAME: System

CURRENT_IRQL: 0

STACK_TEXT:
fffff880`01fc36f0 fffff800`0291bca9 : fffffa80`079d88d0 fffffa80`06a11b50 fffffa80`00000007 00000000`00000000 : nt!WheapCreateLiveTriageDump+0x6c
fffff880`01fc3c10 fffff800`027fce87 : fffffa80`079d88d0 fffff800`028762d8 fffffa80`06a11b50 00000000`00000000 : nt!WheapCreateTriageDumpFromPreviousSession+0x49
fffff880`01fc3c40 fffff800`02764285 : fffff800`028d7ae0 00000000`00000001 fffffa80`07992820 fffffa80`06a11b50 : nt!WheapProcessWorkQueueItem+0x57
fffff880`01fc3c80 fffff800`026da251 : fffff880`010f4e00 fffff800`02764260 fffffa80`06a11b00 fffff800`03a3f150 : nt!WheapWorkQueueWorkerRoutine+0x25
fffff880`01fc3cb0 fffff800`0296eede : fffff800`039b3ff8 fffffa80`06a11b50 00000000`00000080 fffffa80`06a08b30 : nt!ExpWorkerThread+0x111
fffff880`01fc3d40 fffff800`026c1906 : fffff880`01e5d180 fffffa80`06a11b50 fffff880`01e67fc0 00000002`00000006 : nt!PspSystemThreadStartup+0x5a
fffff880`01fc3d80 00000000`00000000 : fffff880`01fc4000 fffff880`01fbe000 fffff880`01fc30a0 00000000`00000000 : nt!KiStartSystemThread+0x16


STACK_COMMAND: kb

FOLLOWUP_NAME: MachineOwner

MODULE_NAME: AuthenticAMD

IMAGE_NAME: AuthenticAMD

DEBUG_FLR_IMAGE_TIMESTAMP: 0

FAILURE_BUCKET_ID: X64_0x124_AuthenticAMD_PROCESSOR_BUS_PRV

BUCKET_ID: X64_0x124_AuthenticAMD_PROCESSOR_BUS_PRV

Followup: MachineOwner

Thanks, I've now got the BSOD log program on my PC. I just performed a repair installation of W7, so I'm hoping that fixed the issue. If not and the BlueScreens continue, I'll get the log file up here soon.

Well, the repair install didn't fix anything... Happened to me again a few minutes ago. Here's the folder created by SF Diagnostic Tool.

Anyone? :/

Bump