My desktop is out of warranty and I can not find my Recovery disk...but I need to reset my desktop to the factory specs...I can't find any information on how to do this? Please help.

I got my nice shiny new Alienware X51 about two months ago and well I love it, It easily runs all my games on max settings with everything enabled at 1080p although aliasing must be set to x2 for a constant over 40 fps. These games including:- Bioshock infinite +50 FPS Arma 3 Alpha +40 FPS

XPS 15-1579sLV is a specific model for XPS 15 which comes with Intel Core i5 3210M 2.5 GHzNVIDIA GeForce GT 630M with 1GBIntel Centrino Advanced-N 6235 with Bluetooth 4.0Backlit Keyboard65WHr battery; 9-Cell Li-Polymer (built-in). I hope this information would be useful for you.