(I hope the title is correct. I'm no Windows UWP developer, but nothing works, so I guess their UWP system is gone here, but correct me if I'm wrong, please)
So I messed up UWP..... Not sure how though, but was related to installing custom themes. When I installed the theme, the entire system crashed partially. I would continue to hear the music I had playing, but my main screen went black (back light still On though, just color black) and my secondary screen went partially black, and the rest was a frozen "frame" of a video I was watching there. Then I rebooted the computer and tried to uninstall the program. Just wanted to uninstall it right away before it would crash again. It was said to change to the default theme before uninstalling or I wouldn't be able to login, but I didn't read in time and just clicked Uninstall.... --> stupid, I know. Hopefully this gives some hint of what may have happened?
Anyways, NOTHING related to UWP works on this thing. No Start Menu, or battery/clock/network flyouts, Settings app, Store app, whatever related to UWP (I'm using StartIsBack and Win32 flyouts for battery and clock, so I've that as a workaround - no Win32 flyout for Network though..... cool).
I even tried reinstalling the Store app, but it does nothing, so I guess reinstalling any other UWP apps won't do anything.
If I open the Settings app, it will say "Class not registered". Windows Explorer says Unknown Hard Error on Safe Mode (before it didn't say anything).
WSReset.exe returns ms-windows-store:PurgeCaches Error in file system (-2018374635), if that helps.
I already did some things to try to fix this, but I think I'll only mention the last one, which I believe redid everything I had already done, because I'm talking of a program of Windows repairs --> Tweaking.com. Executed all repairs, and chose the option to reset the Microsoft Store. Nothing worked so far. Only managed to put the taskbar appearing while on full screen with VLC and Edge, so useful having done this, as I can't change any settings because I can't access the damn Settings app...
I can't format this until at least Christmas and I need it working decently... (even on Christmas I'm not sure because I'll have much to do). And anyways I hate formatting computers.... Infinity to have everything ready again and have to reput everything here. Hopefully there's a solution without having to format the computer...
Any ideas on how to fix the UWP system on this thing????? I've tried some ideas, but I think none are meant to repair a completely not working UWP system.... ANY (but I mean ANY) ideas are greatly welcomed and thanks in advance for any help!
EDIT: Not even Show Desktop button works or Win+D XD. Christ, what I did on this thing..... Are such small things on Windows 10 that dependent on UWP...? (unless I broke more than only UWP and have no idea...).