It either needs to appear completely fucked (i.e. won't even boot) or boots to the bitlocker screen, then fails past that point and also the data is corrupted (can't just delete window's startup files).
Dylan Edwards
magnets?
live linux install and dd if=/dev/urandom of=/dev/r bs=512m with varying amounts at the beginning and ending sectors of the disk (or the entire thing and reinstall mbr?)