Switched discs and numbers. How do I start the setup over?

I was formatting a new hard drive and now I can not validate it or start setup over. I have two XP discs but entered the wrong code for the disc I used and now It won't accept either key as valid. Can someone tell me how to start the setup over.Switched discs and numbers. How do I start the setup over?
You better call Microsoft and talk to their support!Switched discs and numbers. How do I start the setup over?
Start again. Full format the drive when you get to that part. (If it still won't, you'll need a GPartEd disk or a Linux disk to format the drive first.)

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