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I installed two OS in my computer, 10.04 and Windows 7, after some mistakes, there is no Windows 7 loader in the grub list, that is to say, I can't enter Windows 7, so what should I do?

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Have you tried sudo update-grub from within Ubuntu. It should auto-detect Windows 7. – StarNamer Aug 13 '12 at 23:30
Please run "sudo os-prober" and include the output in your question. If it produces no output then please run boot info script: and add the contents of the RESULTS.txt to your answer. – Jordan Uggla Aug 14 '12 at 0:04

Try using Boot Repair in Ubuntu.

Installing Boot Repair

  1. Open the Terminal, then type:

    sudo add-apt-repository ppa:yannubuntu/boot-repair && sudo apt-get update

  2. Press Enter.

  3. Then type:

    sudo apt-get install -y boot-repair && (boot-repair &)

  4. Press Enter

Using Boot Repair

Search for Boot Repair in the dash and launch it. Then click the "Recommended Repair" button and wait until it's finished.

Reboot. Is Windows 7 there again?

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