Welcome to the team!
As Vaio said, you would better finish your current unit and then fire another client, I don't know if you can safely transfer WUs between clients.
Configuring the console client is pretty straightforward, you just have to execute the client in a DOS window, reply to some settings questions and it works without you noticing after that. I recomend setting the client as a service.
As you have a X2, if you want to take the most out of your processor, you have to either have two instances of the program running, each on its own folder and with a different ID (one of the initial settings, just have to set a different number for each) or use the experimental SMP client. I'll try it as well.