The clients default to MachineID number 1.
You have to configure one of the clients to a different number.
For the Console client: Make a shortcut to the client and right click the new shortcut and select Properties. In the Target textbox, to the right of what is in there add a space, a dash, and "configonly" without the quotes. When you run this shortcut the client will enter configuration mode. Answer the questions or accept the default, when you get to Advanced options answer Yes and you will get to the place where you can change the MachineID.
If you need further help, please ask!
Thanks for running Folding@Home :thumbsup: