Oh my!

I know JUST how you feel! I've done this before to my computer and boy was I mad at myself! If you have Windows XP, try inserting the CD and it should load by itself. When it gets to the part where it asks if it should format and install a fresh copy, or just install a fresh copy, make sure to have it format and install a fresh copy. Its pretty easy to format with xp. If you don't have xp, well, then I don't know. Good luck! Its awful when such things happen!