Hi Jishnu,
My name is Cindy. I am sorry you are having this problem. I know it is really frustrating. I will do my best to help you with this problem.
Please note: This is a user-to-user community forum. We are users just like you who help others. We are not employees of Microsoft.
Thank you for writing. There are several things we can do to find out what the problem is with the upgrade on your computer.
Please run the Heath Check in the link below. This will tell you what you need to do to upgrade to Windows 11. Download this to the computer. You will see the results. You may need to scroll down the page to have the complete results. Please send me a screenshot of the entire page.
https://www.microsoft.com/en-us/windows/windows...
Please send me the information on your computer such has the make and model of the computer, the amount of Ram and storage.
Best Wishes,
Cindy