If you have some money to spare I would just chuck the thing and build your own computer. It can be done starting at about $500 including the OS: Here:
If you want something better than that, I built my own rig a couple months ago, and so far I have had zero issues with it. It can run a 1000-part KSP craft at about 7-8 FPS, has a well-rounded component selection, and is a general good mid-high level gaming computer. http://pcpartpicker.com/p/27mpa I put in 16GB of RAM, a GeForce GTX 650, not 660, graphics card, and a 1TB hard drive in my machine, but I optimized it for you. If you buy the parts at Micro Center is will cost you about $950.