your boot disk is creating a ram-drive and using c: for the device name. disable the ram drive by editing the config.sys (or is it autoexec?). Or us another boot disk.
you don't say what OS the system was running, nor which file system. if NT, then I would try booting with the CD or boot disks and running the ERD (if a current ERD exists that HW/SW type). You could then attempt to recover the boot record.
Because the RAMDRV was created using c:, it does not appear as though the system is acknowledging a valid partition exists on that drive. You may need something like Partition Magic to recover the partition though I am uncertain this will work. If Partition Magic can detect a file system, then it may be able to recover the partition info. If it cannot detect a file system, then the partition may be unrecoverable without some costs involved.