If you ditched the original install and chose to do a dirty install then the only way back to factory state is to ship the machine back to ASUS for reimaging. That where put you back to out of the box state with recovery partition intact. There is no other way to do it.
Other than that see advice above.
Its no secret here that I do not support the incessant urge to reinstall the OS from scratch. The forum is full of posts just like this one. On desktops its a different story as thats how you started anyhow. For laptops its a different story and they are never the same again after a dirty install.
My advice is and has always been and will always be....
First thing after getting a new machine clone your original drive to a new drive then pull the original and put it away for a rainy day, much like the OP is having now. This way you aill always have the original image for the aw crap moments and can recover without having to send your machine off and paying to have it done, usually costs more in shipping and labor charges than the new drive and certainly saves in future down time. Once you have cloned you can mess around all you want, you have an insurance policy that you pulled and put away. Having the original drive uncompromised also saves time in the RMA process for other problems as only the original equipment and OS are supported.
“Two things are infinite: the universe and human stupidity, I'm not sure about the former” ~ Albert Einstein