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I get error when i try to use update check

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Error Message: There were problems checking for downloading, or installing this update. Firefox could not be updated because: "update XML File malformed (200)"

This happened

Not sure how often

== updated to FireFox 3.6.3 / running MSOffice 2007

Error Message: There were problems checking for downloading, or installing this update. Firefox could not be updated because: "update XML File malformed (200)" == This happened == Not sure how often == updated to FireFox 3.6.3 / running MSOffice 2007

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OK, I checked for everything suggested in "AUS Update XML File Malformed 200" and none of the suggestions seemed applicable: I have no extension named Noscript, I can access secure sites, the url in "about:config" cannot be reset, I have no cookie named "aus2". --But the MERE ACT of trying these suggestions made my "XML File Malformed 200" message go away, at least temporarily -- I can now click Help/CheckForUpdates and the "Malformed" message does not appear, instead a message appears saying (words to the effect of) I have the most recent version, which is true by comparison of Help/About and the version number at the Firefox Updates site.