BSOD error 0xc000021a on windows 8.1 64 bit.
I'm not sure but I suspect its the windows update, so I need help how to troubleshoot this.
We do need the actual log files (called a DMP files) as they contain the only record of the sequence of events leading up to the crash, what drivers were loaded, and what was responsible.
Please follow our instructions for finding and uploading the files we need to help you fix your computer. They can be found here If you have any questions about the procedure please ask http://answers.microsoft.com/en-us/windows/wiki/windows_10-update/blue-screen-of-death-bsod/1939df35-283f-4830-a4dd-e95ee5d8669d
Please read this wiki to find out how to find and upload your event viewer logs http://answers.microsoft.com/en-us/windows/wiki/windows_10-update/event-viewer-what-is-going-on-in-your-computer/fdda2010-d4df-4fed-863b-89ce0142419d
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