At school the other day, I turned on my virtual PC it said that my BOOT MGR is missing. That is the boot manager. I searched on the internet for a solution and it simply said if you have an installiation disk, but up from there and run a repair and that will fix it.
here is the site http://lifehacker.com/software/troubleshooting/vista-tip--repair-bootmgr-is-missing-error-251733.php
here is the site http://lifehacker.com/software/troubleshooting/vista-tip--repair-bootmgr-is-missing-error-251733.php