Dear RNK 123
Thank you for posting in the microsoft community.
Based on your description, if you have already tried a fresh install of WINDOWS 11, then I think it is a problem due to the difference between the CAD version and your current version of WINDOS.
You can find your main CAD program - right click on the desktop CAD icon - Properties - Shortcut - Open the file where it is located - find the main CAD program - right click - Properties - Compatibility - check the box to run the program in compatibility mode, e.g. compatibility mode is set to WINDOWS7 compatibility mode.
Since CAD is not a Microsoft designed program, the community is limited in the advice it can give you!
Good luck.
I hope the above information can help you.
Best Wish
Shawn Z | Microsoft Community Support Specialist