New Error
I just got an error I never saw before. That's not good news.

I'm posting the minidump below.
Do you know what is the significance of the string "7c90eb94"? It appeared in all my previous dumps and reappeared here. Thanks!
DRIVER_CORRUPTED_EXPOOL (c5)
An attempt was made to access a pageable (or completely invalid) address at an
interrupt request level (IRQL) that is too high. This is
caused by drivers that have corrupted the system pool. Run the driver
verifier against any new (or suspect) drivers, and if that doesn't turn up
the culprit, then use gflags to enable special pool.
Arguments:
Arg1: 0a100005, memory referenced
Arg2: 00000002, IRQL
Arg3: 00000000, value 0 = read operation, 1 = write operation
Arg4: 805437b2, address which referenced memory
Debugging Details:
------------------
BUGCHECK_STR: 0xC5_2
CURRENT_IRQL: 2
FAULTING_IP:
nt!ExDeferredFreePool+ac
805437b2 8b08 mov ecx,dword ptr [eax]
CUSTOMER_CRASH_COUNT: 1
DEFAULT_BUCKET_ID: DRIVER_FAULT
PROCESS_NAME: explorer.exe
LAST_CONTROL_TRANSFER: from 80543e6f to 805437b2
STACK_TEXT:
f08be104 80543e6f 0a100005 000000f8 e31bd200 nt!ExDeferredFreePool+0xac
f08be144 80629fd5 e5392e30 00000000 d792c34c nt!ExFreePoolWithTag+0x489
f08be160 80627bb3 e31bd200 e5709a80 00000000 nt!CmpCleanUpKcbValueCache+0x3d
f08be1c4 806174e0 e31bd200 f08be21c 00000001 nt!CmSetValueKey+0x231
f08be258 f388010e 00001658 029ae1b8 00000000 nt!NtSetValueKey+0x228
WARNING: Stack unwind information not available. Following frames may be wrong.
f08be334 8053c818 00001658 029ae1b8 00000000 SYMEVENT+0x1410e
f08be334 7c90eb94 00001658 029ae1b8 00000000 nt!KiFastCallEntry+0xf8
029ae190 00000000 00000000 00000000 00000000 0x7c90eb94
STACK_COMMAND: kb
FOLLOWUP_IP:
nt!ExDeferredFreePool+ac
805437b2 8b08 mov ecx,dword ptr [eax]
SYMBOL_STACK_INDEX: 0
FOLLOWUP_NAME: Pool_corruption
IMAGE_NAME: Pool_Corruption
DEBUG_FLR_IMAGE_TIMESTAMP: 0
SYMBOL_NAME: nt!ExDeferredFreePool+ac
MODULE_NAME: Pool_Corruption
FAILURE_BUCKET_ID: 0xC5_2_nt!ExDeferredFreePool+ac
BUCKET_ID: 0xC5_2_nt!ExDeferredFreePool+ac
Followup: Pool_corruption
---------
kd> .bugcheck
Bugcheck code 100000C5
Arguments 0a100005 00000002 00000000 805437b2
kd> kb
ChildEBP RetAddr Args to Child
f08be104 80543e6f 0a100005 000000f8 e31bd200 nt!ExDeferredFreePool+0xac
f08be144 80629fd5 e5392e30 00000000 d792c34c nt!ExFreePoolWithTag+0x489
f08be160 80627bb3 e31bd200 e5709a80 00000000 nt!CmpCleanUpKcbValueCache+0x3d
f08be1c4 806174e0 e31bd200 f08be21c 00000001 nt!CmSetValueKey+0x231
f08be258 f388010e 00001658 029ae1b8 00000000 nt!NtSetValueKey+0x228
WARNING: Stack unwind information not available. Following frames may be wrong.
f08be334 8053c818 00001658 029ae1b8 00000000 SYMEVENT+0x1410e
f08be334 7c90eb94 00001658 029ae1b8 00000000 nt!KiFastCallEntry+0xf8
029ae190 00000000 00000000 00000000 00000000 0x7c90eb94
kd> kv
ChildEBP RetAddr Args to Child
f08be104 80543e6f 0a100005 000000f8 e31bd200 nt!ExDeferredFreePool+0xac (FPO: [Non-Fpo])
f08be144 80629fd5 e5392e30 00000000 d792c34c nt!ExFreePoolWithTag+0x489 (FPO: [Non-Fpo])
f08be160 80627bb3 e31bd200 e5709a80 00000000 nt!CmpCleanUpKcbValueCache+0x3d (FPO: [Non-Fpo])
f08be1c4 806174e0 e31bd200 f08be21c 00000001 nt!CmSetValueKey+0x231 (FPO: [Non-Fpo])
f08be258 f388010e 00001658 029ae1b8 00000000 nt!NtSetValueKey+0x228 (FPO: [Non-Fpo])
WARNING: Stack unwind information not available. Following frames may be wrong.
f08be334 8053c818 00001658 029ae1b8 00000000 SYMEVENT+0x1410e
f08be334 7c90eb94 00001658 029ae1b8 00000000 nt!KiFastCallEntry+0xf8 (FPO: [0,0] TrapFrame @ f08be354)
029ae190 00000000 00000000 00000000 00000000 0x7c90eb94
kd> .trap f08be354
ErrCode = 00000000
eax=00000808 ebx=00000000 ecx=00000000 edx=005007d1 esi=7c90e7bc edi=00001658
eip=7c90eb94 esp=029ae14c ebp=029ae190 iopl=0 nv up ei pl zr na pe nc
cs=001b ss=0023 ds=0023 es=0023 fs=003b gs=0000 efl=00000246
001b:7c90eb94 ?? ???
kd> kb
*** Stack trace for last set context - .thread/.cxr resets it
ChildEBP RetAddr Args to Child
WARNING: Frame IP not in any known module. Following frames may be wrong.
029ae190 00000000 00000000 00000000 00000000 0x7c90eb94