Evoluent Lefthanded Keyboard

The keyboard is plug & play and uses the standard keyboard and USB drivers stored on the operating system.

There are several possible causes. Try the following options:

Try connecting the keyboard to a different USB port. Preferably one that is connected directly to the PC. Then restart your computer.

Windows OS like (Win. 98, XT, 2000, Vista, Win. 7, 8, etc).
As for other OS such as Apple Mac and Linux system, should work with those computers as long as the system supports USB keyboard.
However; function keys (Office short cut keys, multimedia keys, Windows keys etc) might not work properly on those non-Windows OS PCs.