You are very welcome.
Will edit this reply in about an hour with some instructions.
Before you install the video card.
If you don't already have it, download your MB manual, > http://www.asus.com/...elpDesk_Manual/
Download the latest driver for the GPU, save to the desktop, (make sure the search details are correct, big download) > http://www.geforce.com/drivers
Shut down, > disconnect the PSU and cable to the monitor.
Before working inside the computer, breifly touch a bare part of the case to discharge static from your body.
Your card will be installed in the first PCI-e slot (blue)
Remove the screw from the first slot cover and save it, if the cover is not the lift out type, you will have to wiggle it side to side to break it off.
Install the card, pressing down firmly, use the screw you saved to fasten it to the slot opening.
Connect the monitor and switch on.
Connect the PSU, > start the computer.
If the Found New Hardware start, Stop It.
Click on the driver package you saved on the desktop and follow the promps.
When installation is finished, run the display set up wizard. Good luck.