Hello. I believe I know what this is. I will keep it pretty simple and I will just say. I think you installed an amnesic Windows. I was going to use the word persistent as in it forgets but it is not called that. This can happen when the files are read-only or there is lack of permissions for the change to happen. It honestly sounds like both are happening with your windows. I would suggest to back up all of your important cat photos to an external drive.
I would try to make a new user first just to see if that works out
Just go to C:\Windows\System32 - right click on cmd.exe and run as admin then type netplwiz.exe and hit enter and make a new user.
If that fails then at that point the best thing to do would be to reinstall windows. Then if that reinstall is doing the same thing in regards to forgetting . That would mean you would need to install windows using media creation tool using a brand new usb drive.
IF you do not think you can do this then bring the device into a computer repair shop.