Web browsers are applications used primarily to display documents, files and media from the Internet, identified by a Uniform Resource Identifier (URI) that can be a page, image, video or other file. Some browsers require the use of add-ons or extensions to safely render the information they receive; others have systems built into them to perform the same functions.
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Which IE are you running up 32 or 64 bit?
see here: http://kb2.adobe.com/cps/000/6b3af6c9.html