If you like Ubuntu and decided to try and dual boot it with your existing Windows 7 system, you might want to know how to remove it safely when you don't want it anymore. Sure you can go ahead and delete the various linux formatted volumes from your primary hard disk but that will also delete the GRUB boot loader, which took over booting Windows as well.

In order to restore the Windows Boot Loader you need to unplug any additional hard drives (leaving only the primary drive with your windows install) boot up your Windows Install Disc and run a repair. Next, drop into the Command Line and run the following commands:

This will backup the existing Boot Configuration Data and rebuild it. When asked to make sure to accept the Windows Install by typing "Y" for yes. you may also want to run a /fixmbr and /fixboot switch using the bootrec utility again. When you restart your Windows install should boot right up.