Hi
I faced the same problem a few days ago. I have two accounts that work fine on my laptop, but when I created a third account I had a problem with Start button. I had tried different solutions but nothing helped. In the end, I found a recommendation in Community to remove/rename C:\Users{Problem account}\AppData\Local\Microsoft\Windows folder using a different account, so the system can re-create it properly. I tried it, Start menu problem is gone, but I had an error with opening files like jpg.
My solution was to delete C:\Users{Problem account}\AppData\Local\Microsoft\Windows\Shell folder using a different account. Now everything works fine.
bro you are a life saver had same issue with just 1 account, tried everything but only this solution worked thanks