How to repair security permissions on a Windows 10 User Profile - Can't open any "Modern Apps" - Event ID 5973 - Apps

I copied my files from an old PC to the new PC and wasn't thinking. I right clicked on the C:\Users\USERNAME folder, went to properties, Security, Advanced, and made myself owner, then made sure Owner, System, Administrators, and USERNAME all have Full Control over the folder. I checked the boxes to change this for all sub folders and files.

Since then, I'm unable to open up (I think) any Modern Apps, unable to open Cortana, Start Menu, etc. I'm hoping this is an easy fix; I'd rather not recreate the entire profile. Please help!

Thanks.
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ITworksAsked:
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JohnBusiness Consultant (Owner)Commented:
You normally cannot fix a profile (common issue here).

Try running System File Checker. I have my doubts but it is worth a try.

Open cmd.exe with Run as Administrator and run SFC /SCANNOW twice. Close out, shut down, start up and test.

I am running Windows 10 Pro.  Please let us know.
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ITworksAuthor Commented:
I'm running the first SFC /SCANNOW. It's a Surface Pro 3 - i5, 256GB, 8G RAM. Looks like it'll take about 14-18 minutes each scan. Will keep you posted!
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ITworksAuthor Commented:
So it's been an hour and it's been stuck on 75% for a good 30 minutes... Suggestions?
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JohnBusiness Consultant (Owner)Commented:
After about an hour, I would close it. Wait it out if you can. The fact that SFC won't run points to some damage from the upgrade or some other cause. I have always been able to run SFC including my Windows 10 machine.
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McKnifeCommented:
Normally, system files wouldn't be part of the problem since it's about his profile and other profiles work (if I get you right).  So to begin with, you need to tell us what files you copied to your new profile - copying photos for example cannot corrupt anything. Copying ntuser.dat (the main settings file), might ruin anything.
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JohnBusiness Consultant (Owner)Commented:
I tend to agree and offered SFC as a "last ditch" kind of effort. If the profile is damaged, there is not much to do except replace it (delete and remake).
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ITworksAuthor Commented:
I copied Desktop, Documents, Music, Movies, Pictures from a backup into the user's profile folder. I remembered that sometimes permissions might be messed up, so instead of right clicking each of those folders and changing the permission settings, I made the genius decision to right click on the user's folder (C:\Users\David) and changed it so that instead of SYSTEM being the owner, DAVID is the owner, and then set the permission entries so that DAVID, SYSTEM, and ADMINISTRATORS all have full control. I then checked the boxes to Replace all child object permission entries with inheritable permission entries from this object and I did the same with the owner change.

After I saved those changes I noticed the Start button wouldn't open, nor would any Modern Apps, or even Cortana. There are Event IDs showing me that the app won't start, but I can't find the log it's referring to. (Microsoft-Windows-TWinUI/Operational)
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McKnifeCommented:
Download and start procmon. Procmon will log "access denied" as result whenever some access is denied. Procmon will tell you what account was used to access what file so you can modify accordingly - worth a try.
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ITworksAuthor Commented:
I gave up and ended up creating a new user profile. :(
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ITworksAuthor Commented:
I'm bummed it couldn't be figured out, but John did start off by saying "Normally you can't fix profile issues (it's common here)"

I gave McKnife some points for pointing out that SFC is *only* going to fix system files, and profile files aren't system files. Had I seen this sooner I probably wouldn't have even spent the 90 minutes waiting on the SFC to do its thing, and would've focused on recreating the profile from scratch last night.
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JohnBusiness Consultant (Owner)Commented:
Thank you for the update and I was happy to help.
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McKnifeCommented:
You shouldn't have quit like that, could have been a matter of only some minutes to solve it. It was no profile corruption but a permission problem.
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