Over the past year I have noticed that my G5 is taking longer and longer to execute simple functions such as opening files. I notice it most when I re-start my computer and the shut down function times out because it takes so long for everything to quit. I know that Apples don't suffer from the same problems as Windows. However, is it possible that I have picked up some virus, spyware or other unwanted program on my computer that is slowing everything down? I'm at a loss as to what is going on.