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BSOD driver verifier error 0x000000c9 IO Manager Violation

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I began having startup problems leading to a BSOD. When I ran driver verifier, It repeatedly crashed upon reboot and I had to disable verifier in safe mode to boot. The error seemed to be with ntsokrnlpa.exe and HIDCLASS.sys This was after a reinstall (W7 Pro x86 w/ SP1) Stop code: 0x000000c9 (0x00000220, 0x9237FA8C, 0x9B13CE00, 0x8AD70030) The IO Manager has detected a violation by a driver...

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