Restore XP bootloader

Forgive me if this is in the wrong section.

I previously had two partitions on my hard drive, a small one for Ubuntu and the rest for Windows XP. Earlier today I got rid of Ubuntu, and extended my Windows partition to fill the empty space. Unfortunately, Ubuntu was, for lack of better terms, "in charge of" booting up my computer. Now when I start the computer, it sits at the blinking command prompt-esque cursor.

My question is this: how do I put the Windows bootloader back in charge?

I do have the installation disc, if that is of any concern.