Okay, so I rummaged through my pile of boxes, finally found a DVD burner, and made an Ubuntu live disc and booted to it. I didn't need to mount the existing drives because they came up automatically, and I was easily able to mount the NAS drive with no troubles whatsoever. I copied all the data off and now I'll wipe the drive for use as a regular NTFS disc.

Thanks for the help, folks. I'm still interested in trying out the Ubuntu VM, so I'll play around with that.