multiboot with ubuntu 12.04 LTS and windows 7 problem

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http://askubuntu.com – after selecting Windows 7 (loader) a black screen and Ubuntu color and again GRUB. what is the problem ? Please suggest me. any MBR problem repairing etc ? I NEED U R HELP HELP ME I AM ONLY 13 YEARS OLD A NINTH STD STUDENT (HowTos)