It's your laptop that you're having trouble with. From what you said earlier, the other computer doesn't have any problems.
You've had UPnP enabled & don't have a firewall. You've changed ports. This port forwarding is just one last thing to try & see if it will help your download speeds on the laptop. It has helped some people to increase their download speeds (even if they're not firewalled). There's no point setting up port forwarding for the other computer if it has no problems & is downloading normally. Rogers is known for traffic shaping & as I said before, this could be why your downloads are slow on 1 computer....but I don't know for sure. Are you using LW on both computers at the same time?

Is it absolutely vital to have LW on both computers? Maybe you could just use LW on the computer that has no problems?