I have [had!] a 2x w7 + xp dual boot and decided to get rid of xp and reuse its HDD. I tried reformatting its disk from w7 but it would not let me, so I tried to delete all the files on the disk but something [MBR?] is left! Next I tried unplugging the HDDs one at a time to locate the one with xp on it. But the pc would not boot which ever one I tried & allways a "unable to find MBR" message. how do I get out of this mess?