Blue Screen - Pool_corruption

Not sure what the issue is here. Any help would be appreciated
Running Window 7 64bit. The error comes up when working and idle. I have run 3 different memory tests and all passed.

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Symbol search path is: SRV*C:\Symbols*http://msdl.microsoft.com/download/symbols
Executable search path is:
Windows 7 Kernel Version 7601 (Service Pack 1) MP (4 procs) Free x64
Product: WinNt, suite: TerminalServer SingleUserTS
Built by: 7601.17803.amd64fre.win7sp1_gdr.120330-1504
Machine Name:
Kernel base = 0xfffff800`02a5a000 PsLoadedModuleList = 0xfffff800`02c9e670
Debug session time: Mon May 14 14:23:05.563 2012 (UTC - 5:00)
System Uptime: 0 days 0:29:06.982
Loading Kernel Symbols
...............................................................
................................................................
....................
Loading User Symbols
Loading unloaded module list
......
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*                        Bugcheck Analysis                                    *
*                                                                             *
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Use !analyze -v to get detailed debugging information.

BugCheck 1E, {0, 0, 0, 0}

Unable to load image \SystemRoot\system32\DRIVERS\iusb3xhc.sys, Win32 error 0n2
*** WARNING: Unable to verify timestamp for iusb3xhc.sys
*** ERROR: Module load completed but symbols could not be loaded for iusb3xhc.sys
*** WARNING: Unable to verify timestamp for win32k.sys
*** ERROR: Module load completed but symbols could not be loaded for win32k.sys
Probably caused by : Pool_Corruption ( nt!ExDeferredFreePool+100 )

Followup: Pool_corruption
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0: kd> !analyze -v
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*                        Bugcheck Analysis                                    *
*                                                                             *
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KMODE_EXCEPTION_NOT_HANDLED (1e)
This is a very common bugcheck.  Usually the exception address pinpoints
the driver/function that caused the problem.  Always note this address
as well as the link date of the driver/image that contains this address.
Arguments:
Arg1: 0000000000000000, The exception code that was not handled
Arg2: 0000000000000000, The address that the exception occurred at
Arg3: 0000000000000000, Parameter 0 of the exception
Arg4: 0000000000000000, Parameter 1 of the exception

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


EXCEPTION_CODE: (Win32) 0 (0) - The operation completed successfully.

FAULTING_IP:
+6463643333653130
00000000`00000000 ??              ???

EXCEPTION_PARAMETER1:  0000000000000000

EXCEPTION_PARAMETER2:  0000000000000000

ERROR_CODE: (NTSTATUS) 0 - STATUS_WAIT_0

BUGCHECK_STR:  0x1E_0

CUSTOMER_CRASH_COUNT:  1

DEFAULT_BUCKET_ID:  VISTA_DRIVER_FAULT

PROCESS_NAME:  System

CURRENT_IRQL:  2

EXCEPTION_RECORD:  fffff80000b9c4f8 -- (.exr 0xfffff80000b9c4f8)
ExceptionAddress: fffff80002c059bc (nt!ExDeferredFreePool+0x0000000000000100)
   ExceptionCode: c0000005 (Access violation)
  ExceptionFlags: 00000000
NumberParameters: 2
   Parameter[0]: 0000000000000000
   Parameter[1]: ffffffffffffffff
Attempt to read from address ffffffffffffffff

TRAP_FRAME:  fffff80000b9c5a0 -- (.trap 0xfffff80000b9c5a0)
NOTE: The trap frame does not contain all registers.
Some register values may be zeroed or incorrect.
rax=fffffa800a3a2aa0 rbx=0000000000000000 rcx=fffff80002c60740
rdx=c00100000ad45250 rsi=0000000000000000 rdi=0000000000000000
rip=fffff80002c059bc rsp=fffff80000b9c730 rbp=0000000000000000
 r8=c00100000ad45250  r9=fffffa800aeac2a0 r10=0000000000000000
r11=0000000000000000 r12=0000000000000000 r13=0000000000000000
r14=0000000000000000 r15=0000000000000000
iopl=0         nv up ei pl zr na po nc
nt!ExDeferredFreePool+0x100:
fffff800`02c059bc 4c8b02          mov     r8,qword ptr [rdx] ds:90d0:c0010000`0ad45250=????????????????
Resetting default scope

LAST_CONTROL_TRANSFER:  from fffff80002ad0bbe to fffff80002ad9190

STACK_TEXT:  
fffff800`00b9b5d8 fffff800`02ad0bbe : fffffa80`00000000 00000000`000107cd fffff800`00b9bd50 fffff800`02b04180 : nt!KeBugCheck
fffff800`00b9b5e0 fffff800`02b03e4d : fffff800`02cdf770 fffff800`02c1c2f0 fffff800`02a5a000 fffff800`00b9c4f8 : nt!KiKernelCalloutExceptionHandler+0xe
fffff800`00b9b610 fffff800`02b02c25 : fffff800`02c1ffac fffff800`00b9b688 fffff800`00b9c4f8 fffff800`02a5a000 : nt!RtlpExecuteHandlerForException+0xd
fffff800`00b9b640 fffff800`02b13bb1 : fffff800`00b9c4f8 fffff800`00b9bd50 fffff800`00000000 fffffa80`0ab8ff20 : nt!RtlDispatchException+0x415
fffff800`00b9bd20 fffff800`02ad8842 : fffff800`00b9c4f8 00000000`00000000 fffff800`00b9c5a0 00000000`00000000 : nt!KiDispatchException+0x135
fffff800`00b9c3c0 fffff800`02ad714a : 00000000`00000202 fffff800`02ade82a fffff880`03365180 fffffa80`09d8f480 : nt!KiExceptionDispatch+0xc2
fffff800`00b9c5a0 fffff800`02c059bc : fffffa80`0a36d000 00000000`00000000 fffff800`02c4be80 fffffa80`0ace4d10 : nt!KiGeneralProtectionFault+0x10a
fffff800`00b9c730 fffff800`02c051a1 : 00000000`00000000 fffffa80`0af2dbc0 00000000`00000000 00000000`00000000 : nt!ExDeferredFreePool+0x100
fffff800`00b9c7c0 fffff800`02a15865 : fffffa80`0af2dbd0 00000000`00000000 fffffa80`206c6148 fffffa80`06a1fe02 : nt!ExFreePoolWithTag+0x411
fffff800`00b9c870 fffff880`0483789f : fffffa80`0af852a0 fffffa80`09568000 fffffa80`097d5170 fffffa80`06a1fd10 : hal!HalPutScatterGatherList+0x115
fffff800`00b9c8d0 fffffa80`0af852a0 : fffffa80`09568000 fffffa80`097d5170 fffffa80`06a1fd10 fffffa80`097d5170 : iusb3xhc+0x3789f
fffff800`00b9c8d8 fffffa80`09568000 : fffffa80`097d5170 fffffa80`06a1fd10 fffffa80`097d5170 fffff880`048490da : 0xfffffa80`0af852a0
fffff800`00b9c8e0 fffffa80`097d5170 : fffffa80`06a1fd10 fffffa80`097d5170 fffff880`048490da fffffa80`06a13420 : 0xfffffa80`09568000
fffff800`00b9c8e8 fffffa80`06a1fd10 : fffffa80`097d5170 fffff880`048490da fffffa80`06a13420 fffff880`0486bda0 : 0xfffffa80`097d5170
fffff800`00b9c8f0 fffffa80`097d5170 : fffff880`048490da fffffa80`06a13420 fffff880`0486bda0 00000000`00000000 : 0xfffffa80`06a1fd10
fffff800`00b9c8f8 fffff880`048490da : fffffa80`06a13420 fffff880`0486bda0 00000000`00000000 fffffa80`06a1fd10 : 0xfffffa80`097d5170
fffff800`00b9c900 fffffa80`06a13420 : fffff880`0486bda0 00000000`00000000 fffffa80`06a1fd10 00000000`00000000 : iusb3xhc+0x490da
fffff800`00b9c908 fffff880`0486bda0 : 00000000`00000000 fffffa80`06a1fd10 00000000`00000000 fffff880`0482d85b : 0xfffffa80`06a13420
fffff800`00b9c910 00000000`00000000 : fffffa80`06a1fd10 00000000`00000000 fffff880`0482d85b fffffa80`097d5170 : iusb3xhc+0x6bda0


STACK_COMMAND:  kb

FOLLOWUP_IP:
nt!ExDeferredFreePool+100
fffff800`02c059bc 4c8b02          mov     r8,qword ptr [rdx]

SYMBOL_STACK_INDEX:  7

SYMBOL_NAME:  nt!ExDeferredFreePool+100

FOLLOWUP_NAME:  Pool_corruption

IMAGE_NAME:  Pool_Corruption

DEBUG_FLR_IMAGE_TIMESTAMP:  0

MODULE_NAME: Pool_Corruption

FAILURE_BUCKET_ID:  X64_0x1E_0_nt!ExDeferredFreePool+100

BUCKET_ID:  X64_0x1E_0_nt!ExDeferredFreePool+100

Followup: Pool_corruption
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051412-2542-01.dmp