Are you using a 64-bit version of Internet Explorer? You can check by simply selecting "About Internet Explore" from the "Gear" menu in the upper right corner of your browser window.
32-bit About dialog pictured above
64-bit About dialog pictured above. Note the highlighted "64-bit Edition" string after the version number.
Starting with Flash Player 11, both 32 and 64 bit browsers are supported!
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