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How to remove Ubuntu and put Windows back on?

I am a noob with ubuntu and linux and I just think it is better with windows.

My pc is a Compaq Presario CQ57 and It was pre-loaded with Windows 7 Home Premium OA.

I used all my hard drive space for ubuntu, and I would like to get windows back.

THe laptop never came with any recovery partitions or cd disks or anything, just computer, charger, and some Manuals.

Someone accedently threw away the box when i removed windows so I really never would know if there was a hidden cd or anything in there.

I have the product keys and everything just nothing to reinstall windows.

So could someone help me??????