Two fresh AA batteries should be installed in the keyboard and in the correct manner.
Ensure that the keyboard is pointed at the IR Detector. The wireless keyboard uses Infrared light, which requires an unobstructed line-of-sight to operate correctly.
Check to see if your IR Detector’s LED is illuminated. If not, check that the USB connector is properly inserted into the USB port on your PC.
Make sure that the proper USB drivers are installed and working correctly. Please refer to your system settings in the Windows control panel for more information. TIP: Remove the IR Detector’s USB connector from your PC and reinsert it. Your system should attempt to recognize and install the necessary drivers (Win98, 2000, XP only).