When you do a dir C: can you read what was originally on the hdd prior to the upgrade attempt? If so, try booting with a DOS 5.0 boot diskette which contains sys.com in A:, then copy command.com to C: and do a SYS C: from A: as well. This might get this system bootable again. On the other hand, if you can access your original data, now would be a good time to back it up. Good Luck. Marty Mintzell