I have a laptop with Windows XP Professional SP3 on it, later on i dual-booted the machine with ubuntu 13.04. I used a program call AOMEI partition assistant for the partitioning. Windows 8.1 preview came out and i thought to give it a shot, so i downloaded the ISO file, fired up Aomei partition assistant, after merging the ubuntu partition to the C: to get some space for windows 8.1 i went ahead and restarted the computer, AOMEI did its thing and it restarts again and comes up a black screen saying: "error: unknow filesystem. grub rescure>_ (the underscore is blinking) Please HELP!!! Note: I don't have the windows xp sp3 disc, because this is a used laptop
MBR is broken ? - sounds not so good. Simply burn a live-CD with an *.iso-image of supergrub - supergrub can repair almost anything what looks like a broken grub.
supergrub can be obtained here (on the right side - "supergrub2" ) :