I have an HP Pavillion that had Windows Xp Media Ctr edition 2005 as its original windows software but sometime after purchase I reformatted hard drive and installed Vista Business. I want to reinstall the original factory xp but I don't have a CD. I have the original product key. Can this be done?
1) Contact HP.
2) If that fails, contact Microsoft. "I have an OEM licensed machine and the product key but no CD. Can I get the distro?"
3) You can always get a distro off the net, but I wouldn't for two reasons. First, it is likely to be a pirate site. Second, if I wanted to distribute malware, a pre-infected version of the OS install would be a good vehicle.
Is it possible that your machine has a hidden partition with everything needed to do a factory reset? Can you look in Disk Management and see if there is a hidden partition? Sometimes HP and other mfgs do this.