I'm no expert, but I would run the disk utilities repair/restore disk permissions and stuff. Then try it again. I've read that you have to be very careful when you set up the boot camp partition, so that you don't erase you OSX install. make sure that you're reading any documentation and following the instructions exactly as they say.
You should also try the Apple support forums. They have one just for boot camp.http://discussions.apple.com/forum.jspa?forumID=1165