Re: rm -rf
And to get back to your original question... nothing in Ubuntu will help to get Windows back. It will not clear the bios, it will not help the CD boot, and it will not continue to operate if you rm -rf which is "remove recursively and force without prompting". That's an effective way to make a paperweight if you don't know what you're doing.
It seems to me like your Windows disk itself is not bootable. This is pretty typical of older windows install disks, most windows upgrade disks, and a lot of recovery disks supplied with computers. Try it in another computer, try another Windows disk. And then check on the Windows help forums. As you can see the initial answers focused less on what you want to do, and more on what you wanted to try which is really of no help at all.
"If all else fails, immortality can always be assured by spectacular error." -John Kenneth Galbraith, Economist