Boot from the Windows 7 disc, choose Repair > Command Prompt
Once at the X:Sources prompt run the following commands;
1. bootrec /FixBoot. Writes a boot sector onto the system partition to start Windows
2. bootrec /ScanOs. Scans all disks for Windows installations and displays them to you.
3. bootrec /RebuildBcd. Scans all disks for Windows installations and prompts you to pick the ones you want to ad to the BCD.
I’ve only done options 1&2 to fix it myself.