The registry is corrupted. It causes many problems:
+ The computer internal keyboard and mouse (laptop touchpad) is not usable in normal Windows. Device Manager says that is because the registry is corrupted. However when I use Advanced Recovery option they work as usual.
+ mspaint.exe is not working (without any message box or anything)
+ Photos app cannot open ".png" files, also report registry error.
I am quite confident that the computer has no virus.
So I decide to reset the PC before the problem get worse in any way. However it stucks. Not at a particular percent, but the computer stuck after it rebooted, when it done with "Resetting this PC (k%)". I think it ran from 0% to 100%, but I am not sure.
It takes about 3 hours from "Getting started - Preparing... " to "Resetting this PC (100%)", but then I have waited for 7 hours and the screen still hang there. Only the Windows 10 logo and spinning dots.
I choose "Keep my files" option. I find some pages say that I should turn off "Fast startup", but I think that is unrelated because at that point the PC has been resetted. If I hard shutdown the computer it will says "Preparing" then "Undoing changes"...
Now it works almost normally, with the above problems. Because I don't have an external keyboard, please help me as I can't program with osk. Alternatively you can help me resetting the registry only.