You need QUICKTIME or JAVA installed to view virtual tours. Virtual tour is a special kind of photograph that lets you view the place in the maximal angle of view of 360x180 degrees, you can see everything arounds you, above and bellow you. You can zoom by pressing SHIFT key and zoom out by pressing CTRL key.
You can choose to view the virtual tours in low quality for dial-up internet access or high quality for broadband access.
You can find the installers bellow.
QUICKTIME installer
JAVA installer
FLASH installer