How to get windows back? Lubuntu?

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http://askubuntu.com – i installed lubuntu and i dont like it. i did a clean update to lubuntu rather than making it dual. now when i want to go back to windows it wont work like i put the windows vista cd in and it wont load and it just load lubuntu back and i know for a fact that the cd works just fine. i dont know what to do?? i did little research and it say i deleted the windows loader or the Partition i dont know can some one help me thanks (HowTos)