and the 25 (I think) digit serial number that came with it.
http://www.techspot.com/vb/topic53502.htmlhttp://www.softwarenewsdaily.com/2009/04/windows-xp-installation-guide-clean-install-walkthroughAs it's pointless to reinvent the wheel, these are a couple of ready-made tutorials on reloading XP (assuming that's what you have).
To start, you will need to make your computer boot from the Windows CD. Do this by watching the boot screen and hitting the delete key as the computer boots. You can navigate around the BIOS screen with the arrow keys, using 'Enter' as Yes and Escape as No. Somewhere on the screen will be a guide to which keys to use.
BIOS screens are quite varied, but you will be looking for something like Boot Order, the choices being HDD, Floppy, CD. You need to make CD your first boot drive. Press F10 to save changes, confirm and the computer will restart.
Now you'll be able to start your PC and you will get that "Press anykey to boot from CD" prompt.
After that, it's pretty much a matter of being patient and following the prompts on the Windows installation disc.