Hello,
I have read through most of the answers to this question and tried your answer and it did not help me.
I think my issue is different, mine happened after the march, windows 11 update. My explorer would not load without me running the task menu and "run new app" so I was able to restore a previous point and I shut down the windows update option.
I needed a malware app and downloaded a couple different ones and that turned on the windows update to proceed to download this horrible update.
Now I can not click on the setting key to access any of the wonderful choices to use to get into anything. I have tried to reinstall windows 11 and leave my personal info and apps. I tried 4 times, which took forever, and it gets done with the message it was unloading all the installed files and could not finish. I can't add a new user because I can't get to the option. I have run the sfc /scannow, the DISM all those options with the store to check if things are correct and everything there is fine. When it was suggested to change the defaults and associations, nope not an option. It wont open.
I am at an end of working on this for 3 days. So bottom line is it takes a really long time for explorer to load when it does or if it does I may have to use the task menu and run a new app. I can't open any system files that involve using the setting key, and I also get a message of "Class not registered" when trying to open windows update and a few others. and, the Windows button does not work.