Even if your Boot Camp partition is NTFS it should at least mount in Mac OS X (NTFS mounts, but is read-only). If it does not mount then there is likely a problem with the partition, try running chkdsk in Windows.
If the disk does mount but isn't recognized by Parallels as a Boot Camp partition you may need to setup a custom Boot Camp configuration as described in this thread. I've also made this script to automate the setup process. If you have multiple disks in your computer I would recommend telling the script not to launch Parallels when asked, and then adding the script to your login items.
What is the exact error message that it displays? Does it actually say no OS is installed or does it display the error message 'Unable to open disk image Boot Camp'?
Last edited: Jun 20, 2007