|You would run the command fixmbr for no os found.|
Proper procedure, once you get the drive back into the system, is to do a repair install if fixmbr and fixboot don't work. This will keep the data and programs as they are but update the boot and system files. You will need to do all the service packs and updates again since you are at install defaults.
Key here is that the repair install sees the windows install it needs to repair. If no install is found your drive's partition table or the drive itself is hosed.
Next step would be to download the drive manufacturers utilities and run the diagnostics on the drive. If those tests pass then you can try an undelete/partition recovery software.
BTW fixboot copies no files. There is no MS utility except a repair install/manual copy that will restore the boot files ntldr/ntdetect