It's free, and you have the COA on the box, so Microsoft should be helpful.
But I suspect there is something in that reformat and reinstall that went wrong. If your HP has an OEM version of XP on it then using another XP CD from another machine usually only works if that other machine is identical to yours.
Manufacturers nowadays usually do not supply those disks automatically. You need that XP CD and the Drivers CD for the future, so I would ask HP to supply them to you. There may be a small charge.
Hey, everybody. I have a problem...i have an HP computer which has it's on COA on it. Unfortunately, greedy HP does not give you any restore disks or the XP cd on this computer. It was bought new at the store. Too much junk was on it, so I reformated and since I didn't have an XP cd thanks to HP...I borrowed a CD trying to reinstall windows. I reinstalled it....however my COA product key is not working for this computer when I activate it online. What do i need to do...is there a way to activate xp with my COA key? Or do I need to call microsoft and have them activate it for me?