On boot, raid screen was saying mirrored drives were both degrading. Rebooted and entered nvidia raid utility(bare bones) to look at drives. Both looked good and could not understand warning message. Saw the clear mbr and mistakenly thought I was clearing error messages. Not too bright from this vantage point right now. After much reading, now realize what an mbr is and what it was that I pooched. In any event, have tried windows install disc to create a fix as well as testdisk. I have test disk on a flash drive. Windows on it's own cannot repair. It doesn't even see 7. When the flash drive is attached, it sees 7 but it still cannot make the repair. It says so. It also says to remove any media that has been attached. I also followed a repair through the command prompt but that led nowhere and did nothing.Is there a way to make this repair. I do not have the ability to retrieve my data nor do I have a back up. The mirror was supposed to be my back up. Any help would surely be appreciated. Thanks, Bill.