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You may not be able to repair that disk using Disk Utility! You're going to need a Windows machine in order to repair it. Try mounting the drive to a Windows machine. If Disk Manager can "see" it, you can try a repair using the Windows utility. (chkdsk) I suggest you try http://www.paragon-software.com/home/ntfs-mac/ I have never had I/O problems using that software.
Sorry I meant NOT...
Paragon has a free trial make sure you remove the Tuxera software first.
I will get back to you er I see that, thanks
"when" I see that sorry...