Howtogeek posted a guide about removing Ubuntu or XP from the Windows 7 Boot Menu

If you've ever used a dual-boot system and then removed one of the operating systems, it can still show up in Windows 7's boot menu. We'll show you how to get rid of old entries and speed up the boot process.

To edit the boot menu, we will use a program called bcdedit that?s included with Windows 7. There are some third-party graphical applications that will edit the menu, but we prefer to use built-in applications when we can.

  Remove Ubuntu or XP from the Windows 7 Boot Menu