Hi guys, I have a friend that has a older Macbook with the Leopard operating system. Somehow she wound up with the 1-800-741-4144 popup virus. She isn't truly computer literate, and I'm not familiar with her operating system. Her computer was pretty much unresponsive. I was able to eventually talk her through a force quit which allowed her to shut down the computer and then restart it. It seems to be functioning properly, but I suspect that I will need to remove any new addons in Safari. I would appreciate any suggestions regarding cleaning this mess out of her computer.