Hi, I have a Macbook Pro 5,5, and it is CONSTANTLY freezing for a few seconds at a time. At first I thought it was just firefox, but it will just stop and I can keep typing and 5 seconds later what i typed will show up. But it happens during other applications too, like when I will be looking at pictures the screen will freeze and load and if I keep scrolling it will fast forward to where I scrolled to. It happens all the time, 2-3 times a minute and at first it was a minor annoyance but at this point it is really irritating me. What could cause this? A corrupted application? Bad file? Virus Will upgrading to Lion help at all? Thank you for your help!