Be sure you've installed the dongle's drivers first!
If in a moment of exuberance you've inserted the dongle before the drivers are installed, remove it and run the dongle driver installation wizard.
NOTE: Windows XP may open the Found New Hardware Wizard each time you plug the dongle into a different USB port. If so, just click through the wizard screens again with the choices illustrated below.
If you are running Windows Vista, the New Hardware wizard will look a bit different. Please consult the screen shots in the dongle.pdf file that you'll find in your ForScore program folder.
If your computer is running XP, a New Hardware Wizard will open when XP first detects the dongle.
Click No, then Next.
Click Automatically, then click Next.
The wizard will churn for a few seconds
Then click Finish.