Snip & sketch freezes windows

I also had this problem after updating to 20H2 for both an in place upgrade from 1909 and a fresh install of 20H2. For me it turned out to be a Group Policy causing the problem.

I posted this answer here originally "https://answers.microsoft.com/en-us/windows/forum/windows_10-hardware/windows-10-20h2-snip-sketch-problem/440f157c-ad10-4fd0-aa4d-878c847c8748"

I don't know if this will apply for everyone, but I also had this problem and tried all the sfc, dism, and add-appxpackage registration fixes to no avail.

What turned out to fix it for me was setting a group policy called "Download missing COM components" to "Not Configured". I previously had it enabled.

It is available under "Computer Configuration\Administrative Templates\System". In my case, this was an AD environment and I had access to fix this at the network level, but on an individual computer with admin rights running win 10 pro or a higher version, you should theoretically be able to set his using gpedit.msc 

Also in theory you could look in the registry for 

HKCU\Software\Policies\Microsoft\Windows\App Management!COMClassStore

and 

HKLM\Software\Policies\Microsoft\Windows\App Management!COMClassStore

and delete those keys if they exist (backing them up first by exporting the keys of course)

Hope this helps somebody. This also fixed problems I had with the Your Phone app auto closing.

I imagine setting this to disabled in group policy or a Dword of '0' in the registry may also work (that's untested though, I don't know exactly what it looks like in the registry), but sometimes that causes unexpected behavior vs. Not Configured. I think it's just an old policy (came around for Windows 2000) and it causes an incompatibility with the newest version.