How to Fix ‘Grub Rescue’ Prompt for Ubuntu

After I have installed dual-booting Windows 7 with Ubuntu 12.10, my laptop stuck on grub rescue screen and cannot continue to boot screen. Actually after I installed Ubuntu I want to install Windows 8 and then compare them and determine which is the best. But I must delay to compare them and try to solve grub rescue problem.If you see the same problem with image below, I will tell you how to solve grub rescue problem.

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