In all seriousness, I think my computer contracted something. I'm running the most current OS on a Santa Rosa Powerbook - but I installed both Limewire and Audacity today, forgetting that they can be suspect ... now Mail, iChat, and many other programs (Garage Band) - I haven't even tested them all NO LONGER WILL OPEN. They give me the error message every time. I've even zapped the PRAM. What have I done? What do I do?