I could only make a 3 GB FAT32 partition though - what gives? Even then, the Ubuntu partition tool wasn't able to install itself. Though, for some reason, now I have this 3.37 GB partition viewable in windows, and it looks like a backup partition [there's things like "RECOVER.BAT"]. I've never seen it until, like, yesterday.
I think what I should do instead is get another hard drive anyway, make that one FAT32 and put Ubuntu on that. I only have 30 GB or so left on this one anyway, and that could fill up fast!