Actually the easy method is to format and reinstall the system. Sometimes it may failure to recover the files you want. I have deleted my photos accidentally then find a photo recovery software to recover them, Somehow, i lost many precious photos.
If you format to reinstall, it will under no circumstances recover your files which must be done before you format.
You will lose your files if you format the HD, making them nearly impossible to recover except by expensive methods.
To recover your files before install see the note in Step 3 to Clean Reinstall - Factory OEM Windows 7
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