From your minidump,
BugCheck 1000008E, {c0000005, 81cf4824, 81cf1d21, 0}
Probably caused by : hardware ( nt!KiInitialPCR+124 )
KERNEL_MODE_EXCEPTION_NOT_HANDLED_M (1000008e)
Debugging Details:
------------------
EXCEPTION_CODE: (NTSTATUS) 0xc0000005 - The instruction at "0x%08lx" referenced memory at "0x%08lx". The memory could not be "%s".
FAULTING_IP:
nt!KiInitialPCR+124
81cf4824 0083cf810000 add byte ptr [ebx+81CFh],al
TRAP_FRAME: 81cf1d21 -- (.trap 0xffffffff81cf1d21)
ErrCode = 00000002
eax=81cf4c38 ebx=00000000 ecx=81d323c0 edx=00000000 esi=9e3ef9c8 edi=81cf4d10
eip=81cf4824 esp=81cf1d95 ebp=81cf1ce8 iopl=0 ov dn ei pl nz ac po cy
cs=0008 ss=0010 ds=0023 es=0023 fs=0030 gs=0000 efl=00010e13
nt!KiInitialPCR+0x124:
81cf4824 0083cf810000 add byte ptr [ebx+81CFh],al ds:0023:000081cf=??
Resetting default scope
CUSTOMER_CRASH_COUNT: 1
DEFAULT_BUCKET_ID:
VISTA_DRIVER_FAULTBUGCHECK_STR: 0x8E
PROCESS_NAME: Idle
CURRENT_IRQL: 1b
MISALIGNED_IP:
nt!KiInitialPCR+124
81cf4824 0083cf810000 add byte ptr [ebx+81CFh],al
UNALIGNED_STACK_POINTER: 81cf1d95
LAST_CONTROL_TRANSFER: from 00000000 to 81cf4824
STACK_TEXT:
81cf1d91 00000000 00000000 00000000 00000000 nt!KiInitialPCR+0x124
STACK_COMMAND: kb
FOLLOWUP_IP:
nt!KiInitialPCR+124
81cf4824 0083cf810000 add byte ptr [ebx+81CFh],al
SYMBOL_STACK_INDEX: 0
FOLLOWUP_NAME: MachineOwner
IMAGE_NAME: hardware
DEBUG_FLR_IMAGE_TIMESTAMP: 0
SYMBOL_NAME: nt!KiInitialPCR+124
MODULE_NAME:
hardwareFAILURE_BUCKET_ID: IP_MISALIGNED
BUCKET_ID:
IP_MISALIGNEDFrom the bolded error, it is mostly related to your hardware (either overheating/overstressing/unstable RAM) or simply bad driver.
If you have done before a memory diagnostic on your system and came out okay, why not try to uninstall your sound card and see if the problem still exist.
Btw, is this the first bluescreen your system had?
Agree with tthm, this could be a memory failure. The debugger can't display virtual address in the esp register. How did you test the ram? To be effective, ram need to be tested one after another in each slot.