Ok, so far I have never got any real help from other places. I have a 100% legit copy of Windows XP Pro OEM I bought from Newegg Now my current installation is messed up because I messed around with the regedit and it wont boot up at all. My bad I have recently changed my CPU, RAM and added a hard drive. After I reformat and re-install Windows XP Pro agian, will I be able to re-activate over the internet quickly and painlessly, or will I have to phone in to Microsoft to re-activate, since it is a OEM copy? Please dont go off topic and talk about corporate edition, or tell me to get a corporate edition of WinXP because that's about the only answer I get from other forums. Any help appreciated!