Hi guys,
If you want to re-install XP without re-activating it, here's how you do it!
Goto your C: (if thats where you installed XP) Windows-system32
folder.
Scroll down and find a small file (about 4kb) called wpa.dbl (Windows Product Activation.dbl) Copy this file to floppy disk.
Apparently, this is your activation "fingerprint" that you get when you first activate XP, and if you wanna re-install windows without the re-activation, then you copy this file back into the system32 folder after you re-installed XP. If all goes well, you should not need to re-activate. This is assuming that you haven't changed the hardware significantely.
I believe you can change four of ten items in your machine before you need to re-activate (items being hard disk, ram, video card, CPU, etc).
I haven't had to try this out myself yet, so I cant say it definately works, but its worth a go, and dont forget to post your results back here if you try! 😀
Good luck!