Turning my old PC into a backup?

I haev an old PC running windows 95 (no kidding) and want to back up my current PC’s files on it using teamviewer 5. How could I wipe it and install a new OS that would work with teamviewer 5 and not have any programs so I have lots of space? It’s really old and a peice of crap, and this is the only thing it could be used for. Please help.