Make sure your browser is not infected with virus or spywares.  Please run a virus scan from your anti-virus software such as Symantec or McAfee

Reset your browser:  In many cases, the security level or settings is not set correctly, please follow the steps below to reset the browser setting to default.

Launch Internet Explorer and from the toolbar select Tools | Internet Options

Select Security tab, select Internet zone and click Default Level button

The Default Security Level will be reset to Medium.
if not, please click on Custom Level and reset Security Level to Medium

Select Advance Tab and click on Restored Defaults button

With Virtual Earth 3D (Beta), you can view 3D buildings and landmarks in many popular cities and areas. With your mouse, keyboard, or an Xbox 360 Controller for Windows, you can navigate 3D perspectives of land and cities.

When you view a location in 3D, Virtual Earth 3D (Beta) first downloads a low resolution image of the area. If they're available, Virtual Earth 3D (Beta) updates the map with higher resolution images while you view the map. The map view may appear blurry until Virtual Earth 3D (Beta) downloads the higher resolution images.

With the navigation control, you can view cities and streets from different heights and angles. A scale bar in the lower-right corner of the map provides a measure of distance at ground level. The length of the scale bar represents the specified distance at ground level that's closest to you.

Notes Virtual Earth 3D (Beta) looks best if your screen resolution is 1024 x 768 or higher. Three-dimensional data is available for the whole world. However, 3D buildings aren't available for every city. To find out where 3D buildings are available, visit the Current 3D Cities website. This website is available in English only.

Find out more information from Microsoft Live Help

Launch Internet Explorer and from the toolbar select Tools | Internet Options

Select Security tab, select Internet zone and click Custom Level button

Under Miscellaneous, select Enable for Display mixed content and click OK