xul.dll is not valid Windows image

User Help for Mozilla Firefox
Maria Garcia

Post Posted November 11th, 2009, 1:08 pm

Please HELP, I can't get firefox to work: When I click on the "Mozilla Firefox", there is a message that comes up, saying the following: The application or DLL c:\Program files\ Mozilla Firefox\xul.dll is not valid Windows image. I'm not an expert on computers so, I need your help as soon as possible. Thank you.


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Posts: 3165
Joined: October 19th, 2007, 10:19 am

Post Posted November 11th, 2009, 1:26 pm

Perhaps go to and download the latest Firefox version. Then uninstall the one you have and then install the latest version.

As a registered user at this board I can see from your user agent string that you're infected with Zango malware. You also seem to have malware called Sbcydsl. See ... or_malware

You might want to get rid of any malware as your first step.


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Posts: 51630
Joined: July 18th, 2005, 3:25 am

Post Posted November 11th, 2009, 2:34 pm

It may be necessary to delete the Firefox program folder and all its files before installing a new downloaded copy of Firefox.
See ... _reinstall

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