Two ways,
First anything you write to your HD now might overwrite that doc you want back.
If you install anything - try to do it on another partition.
If it has been deleted fro recycle bin , you should easily find it with free Glaryutilities Undelete module.
Try "other builds" - the bottom link of the three
Glary Utilities
Or you can use free ShadowExplorer - to look in your shadow copies - if a shadow copy was made before the file disappeared - it will be there to "export". i.e. copy back.
ShadowExplorer.com - About 
Originally Posted by
Partifaction
So this is what I did. I wrote a very important essay due tomorrow. I highlighted all of my documents and dragged them onto the C:\ drive. From the C:\ drive I dragged them into the recycle bin and then deleted them from there. I restarted my computer and noticed that I don't have any documents at all!! Can somebody please help me retrieve them??? I really need them and your help will be highly appreciated!!! Thanks!!!