I've just installed ubuntu 8.04 by overwriting my windows drive. So I no longer have windows at all.
The only problem is Grub somehow didn't overwrite the windows boot loader, when I turn on my computer I get the windows boot loader and immediately following that I get a message saying that Windows is corrupt and it couldn't boot.
The only way I can get into the ubuntu thats installed on the drive is by booting into the liveCD and telling it to boot from the first hard disk. In this case I get Grub and can boot successfully into ubuntu.
I've tried redoing the Grub install with grub-install and setup(from within grub's interface) and both failed.