Ubuntu might let you force the disk to mount, and then you can properly unmount it, but I don't think it will, if that's the error you're getting.
Anyway, this might solve your problems. It's got a bunch of disk utilities, and it helped me a lot when I borked my registry:
http://www.ultimatebootcd.com/Or, if you have your Windows Install CD, you can run the Recovery console off of it.
_________________
My Warcraft III Tool CollectionIf you want to chat/game with me:
Blizzard: Senethior459#1962
Discord: Kyle#7409
Steam: Spacekidkyle