Like CoastalDriver says, do a reinstall. Make sure to install it using "Run as administrator" if your OS is Vista/Win7/Win8! Use the "Repair" option when given the choice of "Repair" or "Remove".

The Yoke is a 2D panel that should pop up when you press the Yoke icon on the SimIcon panel. I never use it myself. The 3D yoke in the VC should always be visible, you can hide/show it using the SimIcon button.