Computer crashed and cannot boot up?!?

I got win 7 x64

Hey I need some help because my computer will not boot.
So I started with a program that was not capable with windows 7.
Discovered that there was a mode called xp mode or capibility mode. This mode allowed the program to run. Then after that, I downloaded another program (my computer was still in xp mode) and when this program ran, my computer shut off, and was unable to turn on again.
I've tried everything from letting it sit and try to fix the problem restoring yesterday's backup. I have an external drive plugged in and it has a backup of the computer. The restore I tried was the windows system restore. I have a backup on he drive that I want to restore, but I have no idea how to do so.
It includes all the files of the computer on the external.
Thanks for the help!

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