You must have done a fresh install of windows rather than just reinstalling...
in that case, windows creates a new set of folders : program files, docu & settings, windows...
That simply replaced(overwrite) the old folders that u already had...
did u install after booting from the CD or installed it from within Windows?
There's a repair option in winxp, which simply replaces the content of the windows folder, but does not change any settings, or deletes any file... also, all your programs will work after doing this....
The option can be accessed after booting from the CD ROM, and choosing to do a fresh install. It will search for any windows already installed, and it will tell you if you have one...
Then it will show you an option of repair...
Thats what we are looking for