Halovivek, if you can run the script that melojo linked to, that would give us a much clearer picture of your setup and what your Ubuntu/Windows booting problem might be. How about trying again:
That will create a "RESULTS.txt" file in the same directory from where the script is run, namely your desktop; please copy/paste the contents of that file to your next post, highlight the copied text, and click the pound sign # graphic in the Ubuntu forum message box so that the text will get "code" tags put around it. If you don't have internet connectivity when using the Live CD, you can instead right-click this link to the script in your web browser, choose "Save link as...", save the "boot_info_script.txt" file, transfer it to your Ubuntu desktop on the Live CD via USB stick, floppy, or however you want to do it, and then do the following in a terminal:
cd ~/Desktop && wget 'http://home.comcast.net/~ubuntu_grub/boot_info_script.txt' && sudo bash boot_info_script.txt
The results of that script will help clarify your setup and hopefully what your problem might be.
sudo bash ~/Desktop/boot_info_script.txt