Modern computer processors are 64-bit capable, and modern versions of Windows such as Windows 7 install the 64-bit edition by default on computers that support it. The operating systems are backwards compatable and can run 32-bit software, Windows includes both a 64-bit version of Internet Explorer and a 32-bit version for backwards compatability. Use the 32-bit version of Internet Explorer for compatability with Web browser plugins such as Adobe's Flash Player, which plays media content on websites such as YouTube. By default, the 64-bit Internet Explorer does not launch unless specifically chosen from the start menu; it also can't be set as the default Web browser.
Close all open Internet Explorer windows.
Launch 32-bit Internet Explorer by clicking "Start," "All Programs" and "Internet Explorer."
Verify any links to Internet Explorer on your desktop or quick launch bar are to the 32-bit version of Internet Explorer by right-clicking them, clicking "Properties," verifing the "Target" box reads "C:\Program Files (x86)\Internet Explorer\iexplore.exe"," with the quotation marks, and clicking "OK."
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Verify any links to Internet Explorer on the Windows 7 taskbar are to the 32-bit version by right-clicking the "Internet Explorer" window entry on your taskbar, right-clicking "Internet Explorer," right-clicking "Properties," verifying the "Target" box reads ""C:\Program Files (x86)\Internet Explorer\iexplore.exe"," with the quotation marks, and clicking "OK."