BOOTMGR image is corrupt-I did a stupid thing

[SimIdiot]

I am running Windows 7 64-bit Home Premium , and have Norton 360.

Last night I set Norton to do the DISK OPTIMIZATION, then "Shut down after completion" .
But then I immediately turn off my power supply!
Now I have the message "BOOTMGR image is corrupt. The system cannot boot."

I am able to access my BIOS, and tried to boot from the optical drive with the Windows 7 disc, but same message.
Please help. Much appreciated!

 

[shadows1234]

press f12 or whatever key brings up the drive selector and boot from the optical drive then reinstall or try a repair windows option