Lorinda, I am not off rep, but I am familiar with the problem: The hub for the clickers needs to be upgraded.
When the hub is in the USB-port; Go to ActivManager, then Control Panel. Choose ActivHub and search for update. Update to latest firmware.
You will also need to upgrade your ActivHub and your ActivExpression devices.
Please follow the steps on article # 10421 on http://www.PrometheanKB.com for the firmware upgrade instructions.
If you have any questions please do not hesitate to get in touch, I have created case 486806 to help support this if you contact us directly.