To view the VR's, you must have Quicktime installed.....

Download the FREE Quicktime installer for Windows or Mac.

How to navigate a QTVR:
Allow the image to completely download dependant upon your connection speed.
The panorama downloads in tiles which can be of different sizes. Sometimes you see a blurry preview first and sometimes just a black grid
You can start viewing and panning it as soon as you see the first parts.

Move your cursor inside the window, hold your mouse button down and drag the panorama in any direction.
Some Cylindric panoramas are only possible to drag in horizontal direction.
The Cubic panoramas can also be viewed all the way up and down.
You can Zoom in by using SHIFT and out with CTRL.