How do I Remove Ubuntu and GRUB from My Computer
You tried to install ubuntu and make dual boot with your exiting Windows operating system. After some while you decide to remove Ubuntu and only use Windows as operating system. But how you do that?
If you just delete the linux partition you will not enter Windows menu because your computer can't call Linux on GRUB. So how you can delete GRUB configuration?
What you need is your CD Windows Installer.
Here the tutorial