Miss Another Operating System

Hi,

I installed two operating systems on one PC. The two systsms are Advanced 2000 Server (on drive C) and 2000 Professional (on drive D), I used one hard drive.

I formated the drive C and re-installed the Advanced Server, but when I reboot the PC, I lost the 2000 Professional on the List Chooice on the Startup step. On the Server, I check: "Control Panel | System | Advanced | Startup and Recovery | System startup (Default operation system)", I fine only one option:' "Microsoft Windows 2000 Advanced Server/"fastdetect ', now I can't use the 2000 Professional.

My question: How I can add the Windows 2000 Professional to the List Chooice on the Startup step and use the Professional again?

Thank you very much.

Jin