I recommend not installing Ubuntu and Windows to the same hard drive. The reason for this is that Windows defends itself against Linux and loves to overwrite Linux boot code and otherwise stomp over your preferences. Your computer isn't yours. It belongs to Microsoft.
However, if you install Linux on a separate disk, Windows will merely ignore it. That is preferable to Windows attacking it. So here's the plan: let Windows live on its own hard drive, pretending it's the only operating system in the universe.
Meanwhile, we'll install Linux and GRUB (GRand Unified Bootloader) on a completely separate hard drive. We'll set up the computer to boot from the Linux disk. Since the central value of the Linux community is interoperability, GRUB will automatically find Windows and let you boot into Windows if you prefer. It will also start Ubuntu if you wish.
That leaves it possible to boot either disk. If you boot the Ubuntu disk you have the choice of what you want to run. If you boot the Windows disk, then Windows is the only operating system in the universe, just like it demands.
Balance is restored to the cosmos!
