Bootcamp windows 7 setup was unable to create a new system partition

I've been trying to load Win 7 sp1 64 for a week.  Tried 4 versions, all 64b, made a new USB drive each time, I always get stuck in the same place:
"setup was unable to create a new system partition or locate existing system partition". I've tried everything, read MANY forums.
I read format in set-up many times, but it matters not!  HELP!

Restart your machine and do a pram reset (google)
Open disk utility and repair permissions twice, also you should only have 1 partition
Then try boot camp assistant again
If this doesn't work, you'll need to either clean install OSX or have a terminal disk wizard from here try and help

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