Hello Elmer.
As you stated, you had a Bugcheck 4E, PEN_LIST_CORRUPT. Generally it is caused by either a device driver or memory issue.
Code:
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* *
* Bugcheck Analysis *
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Use !analyze -v to get detailed debugging information.
BugCheck 4E, {99, 55ac3, 2, 1080c2}
Probably caused by : memory_corruption ( nt!MiBadShareCount+4c )
Followup: MachineOwner ► Before going to do anything further, let us
enable Driver Verifier.
Run driver verifier for next 24 hours or the occurrence of the next dump, whichever is earlier.
Report us the result, with the crash dump, if any.
► You are slightly overclocked.
Code:
kd> !sysinfo cpuspeed
CPUID: "Intel(R) Core(TM) i7-2600K CPU @ 3.40GHz"
MaxSpeed: 3400
CurrentSpeed: 3411
As it is crashing, better you get back to default for the time being.