Not sure if it's anything to do with 10.4.8, but recently my MacBook is woefully unreliable. Apart from a few serious errors that closed down OS X, it's just weird stuff like shutting down programs and then they just stay in the dock unresponsive and are needed to be forced quit. This happens to frequently for my liking. Furthermore, currently my bluetooth is 'unavailable' and the icon has an X through it. Anyone else notice things like these? Think it could be a virus ?