On the workstation, while it is on and WinClient is loaded. Tap on the Upper left then upper right then Upper Left again, you will get a screen with some numbers on it, multiply the first two together, then add the 4th and 6th numbers to that and enter that number. Press the configuration button > MAG STRIPE READERS > Click on ENABLE PC KEYBOARD READER. Then click on Previous Menu (twice) and then Restart.
Test the Mag Reader once the workstation starts the Winclient and is ready.