Is there a utility to reset all W10 permissions back to defaults?

I ran that program and now I cannot use regadd. Everything else works.

However I can use regadd just fine in safe mode.

Callender said:

Don't use without a backup and only apply fixes that you are sure are needed.
UVK - Ultra Virus Killer
Free version is fine. No need to upgrade to pro.
About system repair section:
UVK Help - System repair

Posting this 8 months later, Installed UVK for the same reason as mentioned above. Namely, I messed up the registry permissions because tried to enable the Diagnostic Policy Service. In essence v20H2 is a mess of bugs.

The end result was that it did nothing. My changes to the permissions remained the same.

Do a Repair Install. Seems like that would fix it with minimal impact to your system. Repair Install Windows 10 with an In-place Upgrade

If on 20H2 you need to make a few registry changes first: Known and Resolved issues for Windows 10 version 20H2 - post #159

Thanks for the advice. After weighing my options, and the time needed on the number of issues to correct, I decided to do a fresh install of 2004 and all the needed apps. Including Windows updates and software installation took less than three hours. Before v20H2 I had v1909 which also functioned superbly for my needs.

Frankly my experience with OS repairs is negative.

ineuw said:

Frankly my experience with OS repairs is negative.

My experience has been just the opposite, nothing but positive. I did one for 20H2 on the evening of the 8th and it went great with minimal impact to tweaks and installed software on my system. I've also done it with 1903 and 1909 and they were also positive experiences for me.

30+ years experience thought me otherwise. Specifically referring to the value of time spent.

I like to experiment which is why I try different methods. The journey is (almost) as important to me as the destination.

I do too at times, but not in the middle of work and that's what counts. . . . getting the work done uninterrupted by silly bugs.

Here are the list of problems I noted before reverting to 2004

Version 20H2 - firewall crashes - DPS disabled - LAN network is not working - Diagnostic policy service cannot start because access is denied - After each reboot windows rejects Irfanview as default photo editor and Firefox as the default browser, so I was was forced to uninstall Edge - The unchangeable start menu charcoal background is disturbing.

Perfect set of problems to try a Repair Install on