How to remove the option to boot from Ubuntu in the Windows Boot loader?

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http://askubuntu.com – An year and a half ago, I installed Ubuntu on my computer using Wubi. After a while I decided to install Ubuntu on a separate partition. So I uninstalled the Ubuntu using Wubi, and installed Ubuntu on a separate partition by booting from the Ubuntu ISO. Though Wubi uninstalled Ubuntu from my Windows partition it did not remove the option in the boot menu. So now when I boot, the grub menu has option for Windows and Ubuntu, but if I choose Windows from the menu, I again get two options - Windows and Ubuntu, this time from the Windows boot loader. If I choose Ubuntu, it just shows and error ask (HowTos)