Windows 11 Start Button not working

Same problem with my laptop dell inspron 3501 start menu not working first I upgrade widows 11 through insider program that time start menu not working then I leave the insider program after that I roll back to windows 10 after few days iam getting official windows 11 update through updater then I install that update still start menu not working in my laptop especially dell inspron 3501. My friends also updated to windows 11 but my friends start menu is perfectly working what is the problem with my laptop