There's a semi-easy way that takes about an hour, hour and a half. You will, however, need an external USB CD drive.
You can move the partitions with a tool called GParted (it's a live Linux distribution). There's one large one you should be able to delete, however it's only important to keep the one marked "Boot" and the other which is your data (the boot partition should be really small).
Afterwards, the MBR table will be messed up (and the computer won't boot). Grab a torrent of the Windows 7 32-bit Recovery CD, and pop it in. You'll get a command prompt, run:
Quote:
bootrec /fixmbr
bootrec /fixboot
bootrec /rebuildbcd
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And you're done, and have about 5GB back.