I have a perowned dell optiplex 780 desktop. Im trying to fix the MBR but nothing works. I used the repair disk it could nt . tried comp doen't recognize the commands. tried restore but says ther are no images. I'm also trying to get the restriction remove spend day on web nothing works. I donen't want to have to reinstall and go through all the updating. Can anyone help. Ive put the drive in another pc It says window is on the disk. Thanks