answer:I’m used Ubuntu a couple of times, but it’s not my distro of choice so some of this may be a bit off. I had thought Ubuntu already had what it needed to read from a Windows partition (these days, it’s Fuse) and automatically mounted it. Try looking in the /mnt directory for a Windows folder. If there isn’t one, look up the mnt command, figure out which is your Windows partition, and try mounting it yourself and see if it works. Grub might need to be uninstalled before you remove Ubuntu, if you go that route. But I’m not sure if it replaces the MBR when it’s uninstalled. If you have the media for Windows it should be possible to boot from the CD in Recovery mode, I think it’s called, and re-write the MBR from there.