Yes, Norton Ghost will give you an exact image of what is on your hard drive, but truthfully, you need to be more careful with the cds that contain the software for you aps and op system.
I believe you can purchase a replacement cd from Microsoft providing you can satisy their legitimacy requirements, and you should do so now before you have a problem.
(you might need the cd for numerous other reasons other than just reloading the op system).
Do you have the key number (license) for your Win XP?
If you do not, Magicaljellybean can get it for you by scanning your software.http://www.magicaljellybean.com/keyfinder.shtml
Also download and run Everest Home Edition - freeware which will give you all you need to know about all the hardware and software in your computer.