How to reinstall XP Pro OEM on new hard drive

My lap top originally had XP Pro preinstalled which I later replaced with Win 2000 Pro because it cleared up a port conflict. Now I want to reinstall the OEM XP Pro on a new hard drive on my laptop. Will Microsoft still have the OEM version available to download? I do have a CD version of Win XP Pro that I could use instead. Suggestions on install on a new hard drive would be appreciated.