windows 7 is not working with Ubuntu 12.04

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http://serverfault.com – I have one problem, I am unable to start windows 7 which is installed with Ubuntu 12.04 because I want to utilize all resource in diff. OS. Let me tell you the installation I have done. I have installed everything with USB because my CD ROM is damaged. 1) I have installed Windows 7 in c: then I have installed Ubuntu 12.04 in C: Now when I start my PC it shows list of OS first like ->Ubuntu 12.04 ->Windows 7 When I click on Windows 7 it do not starts and again shows the list of OS. I have also tried to reinstall the windows 7 using USB but it gives error of something UI or Boot configuration (HowTos)