It is not custom built, just a Dell Inspiron 5423. Thanks for the recommendation, but whocrashed didn't identify a specific driver:
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System Information (local)
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computer name: K
windows version: Windows 7 Service Pack 1, 6.1, build: 7601
windows dir: C:\Windows
Hardware: Inspiron 5423, Dell Inc., 0MNJJC
CPU: GenuineIntel Intel(R) Core(TM) i5-3317U CPU @ 1.70GHz Intel586, level: 6
4 logical processors, active mask: 15
RAM: 6314278912 total
VM: 2147352576, free: 1911795712
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Crash Dump Analysis
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Crash dump directory: C:\Windows\Minidump
Crash dumps are enabled on your computer.
On Mon 12/16/2013 6:22:41 PM GMT your computer crashed
crash dump file: C:\Windows\Minidump\121613-9781-01.dmp
This was probably caused by the following module: ntoskrnl.exe (nt+0x75BC0)
Bugcheck code: 0x9F (0x3, 0xFFFFFA8005917060, 0xFFFFF80000B9C3D8, 0xFFFFFA8005AA9010)
Error: DRIVER_POWER_STATE_FAILURE
file path: C:\Windows\system32\ntoskrnl.exe
product: Microsoft® Windows® Operating System
company: Microsoft Corporation
description: NT Kernel & System
Bug check description: This bug check indicates that the driver is in an inconsistent or invalid power state.
This appears to be a typical software driver bug and is not likely to be caused by a hardware problem.
The crash took place in the Windows kernel. Possibly this problem is caused by another driver that cannot be identified at this time.
On Mon 12/16/2013 6:22:41 PM GMT your computer crashed
crash dump file: C:\Windows\memory.dmp
This was probably caused by the following module: ntkrnlmp.exe (nt!KeBugCheckEx+0x0)
Bugcheck code: 0x9F (0x3, 0xFFFFFA8005917060, 0xFFFFF80000B9C3D8, 0xFFFFFA8005AA9010)
Error: DRIVER_POWER_STATE_FAILURE
Bug check description: This bug check indicates that the driver is in an inconsistent or invalid power state.
This appears to be a typical software driver bug and is not likely to be caused by a hardware problem.
The crash took place in the Windows kernel. Possibly this problem is caused by another driver that cannot be identified at this time.