I built a machine a couple years ago that has been running well until two days ago (of course, as soon as I got my hands on some work). The machine has 3x2gb ram in a Gigabyte triple channel board and a Radeon 5700 series graphics card. As of two days ago, I can boot up and use the machine, but after a while a single app will lock up and gradually all the running apps on the machine will follow suit until it crashes.
Through trying to debug this, I have noticed that I am only every getting up to 30% physical memory, but any active apps I have are page faulting really fast (Chrome is making C~3000~10000/sec, Skype will make ~2000~5000/sec, Catalyst Control Center is make ~2000~4000/sec).
I cleaned out the case and slots with compressed air, ran memory checks, re-installed the graphics driver(I wondered if it had to do with apps that had visual components), and Googled everything I can think of. What am I missing?