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?
Try using Boot Repair in Ubuntu.
Installing Boot Repair
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?