Creating a partition w/o losing data

I've installed OSX on my rig (specs below) and now that everything's working, I'm thinking of dual-booting OSX and Vista or Windows 7 (probably Vista). Unfortunately, I foolishly didn't create a partition for Windows when installing OS X, so now I'm left trying to figure out how to create a partition without losing all my data currently on this one. I'm pretty sure you could do that with Acronis Disk Director in Windows, but neither iPartition nor the built-in Disk Utility allow me to do this, unless I'm missing something.

Also, I can't seem to open Boot Camp. It says I have to update the system's Boot ROM firmware. Is this a known problem with Hackintoshes?