BSOD occurs randomly once or twice a day

Code:

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Use !analyze -v to get detailed debugging information.

BugCheck 19, {3, fffff8a002638080, fffff8a002638080, fffff8a0026380c9}

Probably caused by : Pool_Corruption ( nt!ExDeferredFreePool+c96 )

Followup: Pool_corruption
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BSOD Index

If DV is not crashing the system, that means no driver is failing.
If memtest shows no error, that means no Memory error is there.

Usually there is no any other cause of a stop 0x19.

I am taking my final chance here:

Code:

fffff880`0a4426c8 fffff800`02fa96ea nt!KeBugCheckEx
fffff880`0a4426d0 fffff800`02faa4f1 nt!ExDeferredFreePool+0xc96
fffff880`0a442760 fffff880`02c4a771 nt!ExFreePoolWithTag+0x411
fffff880`0a442810 fffff880`02c4a8e1 dxgkrnl!DXGDEVICE::ProcessTerminationList+0x1b5
fffff880`0a442860 fffff880`02c4e739 dxgkrnl!DXGDEVICE::TerminateAllocations+0xb9
fffff880`0a4428b0 fffff880`02c51285 dxgkrnl!DXGDEVICE::DestroyAllocation+0x99
fffff880`0a442940 fffff960`0019144a dxgkrnl!DxgkDestroyAllocation+0xa9d
fffff880`0a442bf0 fffff800`02e75e53 win32k!NtGdiDdDDIDestroyAllocation+0x12
fffff880`0a442c20 00000000`72c9141a nt!KiSystemServiceCopyEnd+0x13
00000000`0008e2f8 00000000`00000000 0x72c9141a

It appears to be some issue with the DirectX Graphics device. And the device is onboard, Intel(R) HD Graphics .... a motherboard component.

You try to update the display driver ... Intel® HD graphics Driver for Windows 7.

Let us know the results.