It is necessary to delete the MBR content that is loaded by the system if boot loader fails to load while there are multiple Operating System installed in a particular system.
To do this you must have a live cd and login as admin through the terminal mode. If you have a ubuntu live cd read http://atoz-infotech.blogspot.com/2010/01/root-password-in-ubuntu.html this article to login as admin in your linux with extra privilages.
And look over the type of file system your hard disk holds and make the a note of it can be of hda or some other in latest versions of hard disks.
Use the command to clear the MBR data with the dd unix program as
dd if=/dev/zero of=/dev/hda bs=446 count=5;
bs specifies the number of bytes the file is created.
count indicated how much time the process is executed here the clearance is made five times.
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