Thomas, as a note. layingback pointed out that interlock does write the boot sector -- which does not function ideally the way interlock expected it to on the updated NTFS system -- and can cause a corruption of the coding there, which can -- and does -- cause your system to fail to boot. You can use fixboot through the XP recovery console to repair the sector about half the time -- seems to depend on how many changes have been made to it and the degree of corruption.

thou and I, my friend, can, in the most flunkey world, make, each of us, one non-flunkey, one hero, if we like: that will be two heroes to begin with. (Carlyle)