How can i wipe out windows xp from my laptop and reinstall windows Me -the laptops ingenious software?

I be subjected to recently bought a in use accustomed to laptop that is old. The yourselves I had bought it from had connected windows xp on it, equal but it from the first came with windows Me. I lack to separation the windows xp because it runs slows on the laptop because it takes up more retention than the windows Me would. Also I hankering to separation windows xp because it is an wrongful copy. So when I tried to run updates on it, windows would not institute updates because the windows xp is not genuine.
How can i shed windows xp from my laptop and reinstall windows Me -the laptops first software?