Currently Being ModeratedFeb 1, 2013 3:21 PM (in response to musichao)
Sounds like your GUID partition map which stores partition information wasn't updated properly
First install Carbon Copy Cloner into OS X and get yourself a blank powered external drive.
Format the drive in Disk Utility Options: GUID Format: OS X Extended Journaled
Use Carbon Copy Cloner to clone your boot drive to the external drive.
When finished reboot holding the option key down, you can boot from the clone and check it out.
Reboot, disconnect the external drive and hold the Command option and r keys down on your hopefully fast Internet connection, you will download Internet Recovery from Apple.
In Disk Utility select your entire drive at the top, should have the drive makers name and disk size.
Click on Erase and select the next to last on the right slider option, wait a hour to complete.
Check the drive is GUID and OS X Extended Journaled
Connect the clone and reboot holding the option key down to boot from it.
Use Carbon Copy Cloner to reverse clone onto the internal drive.
Reboot and use Disk Utility to Repair Permissions on both drives.
Use System Preferences > Startup Manager to make sure your booting from the internal OS X boot drive.
That will fix your problem, prevent glitches with Bootcamp partition that likely occurred and also shift all your OS X data to the top of the hard drive (if you have one) so the maximum free space is available for Bootcamp partition.
Make sure you have read all the instructions for Bootcamp install, also it only supports Windows 7 with a retail disk