Migrate 12.04 Wubi install to new partition with corrupted win7 install and small hard drive

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http://askubuntu.com – The move from Win7 to Ubuntu 12.04 has been honestly awesome. But I've come into a snag because my Win7 inevitably broke. I can still boot into Ubuntu even though Win7 is broken (won't boot, can't repair). I'd like to Migrate Wubi to a real partition and forget about windows. Presumably under normal conditions I would run the Ubuntu live CD, create a new partition then log back into my Wubi install and migrate using the script to the new partition. But I'm worried if I do that I'll break my current wubi set-up and be unable to migrate. I have a small hard drive, only 75GB and unfortunate (HowTos)