Kernel errors. Have you installed any new programs or hardware about the time this started occurring? Make sure your drivers are all up to date and run a registry cleaning tool, like CCleaner and see if it helps.
No new hardware, other than my xbox 360 controller I use for gaming sometimes. Also, I haven't installed any new applications other than the new metal gear game and Blue Screen Viewer. I'll try ccleaner and see if that helps. Thanks!