Viewing the trailers requires QUICKTIME.
If you don't already have Quicktime installed,
you can download the newest Quicktime player at::
http://www.apple.com/quicktime/

or

You can view the Trailer on Youtube at:

http://www.youtube.com/watch?v=9UFFJOW2OF0

if you're still having trouble, please read the following:

NOTE: THIS ISSUE AFFECTS ONLY USERS OF INTERNET EXPLORER ON WINDOWS.
Microsoft Internet Explorer for Windows, versions 5.5 SP2 and 6.0 (soon to be released) no longer support Netscape-style plug-ins, such as the plug-in installed as part of QuickTime 5.0.2 and earlier versions. Consequently, Windows customers using these versions of Explorer may be unable to view QuickTime content in the browser. Mac users and Netscape users are unaffected.

To restore compatibility, Apple has provided an ActiveX control. Please visit http://www.apple.com/quicktime where you will be prompted to download and install this control if you do not already have it.