This bug appears to be distinct from bug 26058, ubt may be related. While ZenWorks 4 is installed on the machine, there is no registry key as described in the fix on savannah.
https://launchpad.net/distros/ubuntu/+source/grub/+bug/26058 -- booting to XP damages grub MBR https://launchpad.net/bugs/50330 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
