I wish I could use Linux Katmeluv, but I have a CAD program that only works on Windows.

Bert, You can use Linux. Either set your computer up to dual boot or use Virtual Box or similar so that you can have your CAD program running under Windows and other things using Linux.

There is also Wine, the Linux package that lets you run Windows programs within Linux but I suspect your CAD program has too many specialist libraries so would probably not work with Wine.

Being retired I don't need to use big Windows programs any longer so I am now entirely Linux, but at first I set up as dual boot and it worked fine. I now have just three small Windows programs that I use and they all run happily with Wine.