How to install fresh windows? with a twist question...

I've been running windows 10 on my PC a few years and it's getting sluggish (one internal main drive). I also have 2 external hard drives where linked folders to the main drive programs reside.

I'd like to reinstall fresh windows but I don't want to manually reinstall all the programs.

Whats the easiest way to get the benefit of a fresh install and then a SIMPLE way to get back all my old programs onto that internal C drive.

Thanks