I installed Win 7. Boot manager booted Win 7 OK. Set up a new entry for Win XP. Installed Win XP. Re-enabled boot manager due to Win XP rewriting MBR. Booted Win 7 as a test. Plop booted XP. Tried again and booted Win XP. Got the boot sector is same as MBR message. Tried Win 7. Got the same message. What am I doing wrong?