You may need to repair your drive, you need to do this in disk utility. However you need to do this with the install disk as you cant repair disk within OS X.
So you need to put the install cd in, hold down c when booting and launch the cd. When install seem to start, ignore and click utilites on the top bar, then choose disk utility, then run disk repair, and repair your permissions at this time too.
Then restart and then run bootcamp again and see if its working properly.