sihost.exe system warning, unknown hard error. msedge.exe - bad image. error status 0xc000012f re. winmm.dll

[David Evetts]

My Windows 10 PC lets me sign in, briefly shows the desktop and then rapidly flashes between the "welcome" screen and blank white. After about 30 secs the display stabilses on blank white and the taskbar flashes. Mouse and keyboard unresponsive. I can restart in safe mode and i get error message "sihost.exe system warning, unknown hard error". Clicking on that message takes me to "msedge.exe - bad image" error status 0xc000012f about winmm.dll.. Help!

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