Update
Windows 8.1
I have seen my last bootlog. dxgkrnl.sys loads once and thenfails to load 4 times. I have only one dxgkrnl.sys signed by microsoft and insystem32\drivers, with its pair in WinSxS.
I have other non-signed andgenerally smaller dxgkrnl.sys, I do not know their origin, not always in pairs.
What can I do? rename the non-signed dxgkrnl.sys to see if PC worksfine and delete them after some days?
the registry keys with references to dxgkrnl.sys are:
HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\WINEVT\Channels\Microsoft-Windows-DxgKrnl/Diagnostic
HKLM \SOFTWARE\Microsoft\Windows\CurrentVersion\WINEVT\Channels\Microsoft-Windows-DxgKrnl/Performance
HKLM \SOFTWARE\Microsoft\Windows\CurrentVersion\WINEVT\Publishers\{802ec45a-1e99-4b83-9920-87c98277ba9d}
HKLM \SOFTWARE\Microsoft\Windows\CurrentVersion\WINEVT\Publishers\{802ec45a-1e99-4b83-9920-87c98277ba9d}\ChannelReferences\0
HKLM\SYSTEM\ControlSet001\Control\Class\{1264760F-A5C8-4BFE-B314-D56A7B44A362}
HKLM\SYSTEM\ControlSet001\Control\GraphicsDrivers
HKLM\SYSTEM\ControlSet001\Control\SafeBoot\Minimal\dxgkrnl.sys
HKLM\SYSTEM\ControlSet001\Control\SafeBoot\Network\dxgkrnl.sys
HKLM\SYSTEM\ControlSet001\Services\DXGKrnl
HKLM\SYSTEM\CurrentControlSet\Control\Class\{1264760F-A5C8-4BFE-B314-D56A7B44A362}
HKLM\SYSTEM\CurrentControlSet\Control\SafeBoot\Minimal\dxgkrnl.sys v402
HKLM\SYSTEM\CurrentControlSet\Control\SafeBoot\Network\dxgkrnl.sys
HKLM\SYSTEM\CurrentControlSet\Services\DXGKrnl