Flash Player support on 64-bit operating systems
<http://kb2.adobe.com/cps/000/6b3af6c9.html>


Issue


Adobe Flash Player is not supported for playback in a 64-bit browser. However, you can run Flash Player in a 32-bit browser running on a 64-bit operating system.

Reason


Adobe is working on Flash Player support for 64-bit platforms as part of our ongoing commitment to the cross-platform compatibility of Flash Player. We expect to provide native support for 64-bit platforms in an upcoming release of Flash Player following the release of Flash Player 10.1. 

Solution


To use Flash Player to view Flash content on a 64-bit operating system, you must run a 32-bit browser.  For details on setting this up for Windows see Microsoft Help & Support:. 



Related Info from Microsoft
(Extracted from <http://support.microsoft.com/kb/896457/en-us>

Both versions of Internet Explorer share the default home page, the Favorites menu, and the Temporary Internet Files folder. By default, the 32-bit version of Internet Explorer runs when you start the browser from any one of the following locations:
  •     The Quick Launch toolbar
  •     The desktop
  •     The Start menu
  •     A hyperlink or a file type that is associated with Internet Explorer
To start the 64-bit version of Internet Explorer, click Start, and then click Internet Explorer (64-bit). You can also add desktop and Quick Launch icons to start the 64-bit version.

To determine the version of Internet Explorer that you are running, click About Internet Explorer on the Help menu of Internet Explorer. If you are running the 64-bit version of Internet Explorer, the About Internet Explorer window includes a 64-bit descriptor label. The 32-bit version of Internet Explorer does not show a bit-level descriptor.

(Flash_32vs64.htm)