Yes I changed PC but kept my HD. The first couple times was no problem. It's just that I reformatted 4 times in the last couple weeks!
That's it lynchknot You've changed PC which is the reason on why you received "invalid key". It was published in MS page " the Microsoft activation clearinghouse system will automatically allow activation to occur over the Internet four times in one year on substantially different hardware." - http://www.microsoft.com/technet/pro.../xpactiv.asp#d

I do not have to worry then since I'm not changing PC
"Reinstallation of Windows XP on the same or similar hardware and a subsequent, reactivation can be accomplished an infinite number of times"

Originally posted by lynchknot
I don't mind installing windows - it's the reinstallation of all the programs and settings that get me.
BB's idea is very useful (Thanks BB) to avoid activation error or invalid key. I agree with you lynchknot ... it is easy to reinstall Windows but we are trying to avoid the activation problem that you just had. BB's suggestion should help users who changed hardware or plans to change hardware

Regards,
Donna