Ended up with an illegitimate copy of Windows after my friend put "Windows" on my PC. Everything works great, haven't had any issues, really. Updated to 10 from 7. For whatever reason though, years later I have an issue. My start bar is acting all funky and won't open or really do anything. I can still open things pinned to it but it won't open and show programs. I would feel much more comfortable purchasing windows and doing a clean install. i really don't care about having to reinstall everything, I have multiple harddrives.
How do I go about completely legitimizing my Windows experience. I am too scared to just buy a key and have it (for whatever reason) not work. I'd like to know how to do this so I can buy the right kind of key.