Emergency Server 2k down blue screen

This weekend I came in and my server had a blue screen non_accesible_boot_device. I rebooted and tried to boot last known good config. Nothing. I Started the setup from the CD and had to specify the drivers for my Scsi card. I tried recovery console but said no vaild partions avalible. Then I tried the normal setup but the repair options was not there.
It wanted to install a fresh copy and my partition was blank. I had a C and D.
now it is just one big un-partitioned drive. how can I recreate the MBR or boot file. I don’t want to have to reload but I guess that is what I am going to do.