How do I fix this guys? I can't open the device administrator or use win+pause... Upgraded from Win 8.1 -> Win10
clean install if device had genuine 8.1 license you can clean install without key and activates automatically
Try running, from an elevated commands prompt: Dism /online /cleanup-image /restorehealth Sfc /scannow The reason is, it looks like some form of corruption or some other error.
I was not able to fix the runtime error but I am rolling back to Windows 8.1 because Win10 (10240 and prior) have a bug and cannot use 5.1 surround sound through optical/spdif. (Failing test tone and can't reproduce sound from FLAC/MKV movies and especially can't do 5.1 on games using Dolby Digital -real through optical-). You can check it here: answers.microsoft .com/en-us/insider/forum/insider_wintp-insider_devices/windows-10-techincal-preview-build-10041-10240-rtm/f1bf8029-e6f0-4eaf-9645-d041dbdf8b5b?page=18&tm=1437674420761&auth=1 answers.microsoft .com/en-us/insider/forum/insider_wintp-insider_devices/realtek-51-sound-not-working-windows-10-technical/aa536a1b-9c88-492a-95ae-7abe7b62a655?tab=question&status=AllReplies%2CAllReplies&page=9