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I cannot run setup because a box appears saying it is not a valid win32 application

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I have down loaded Firefox but cannot run the set up. When I try and open set up, a box appears saying the it is not a valid win 32 application. How do I get round this please?

I have down loaded Firefox but cannot run the set up. When I try and open set up, a box appears saying the it is not a valid win 32 application. How do I get round this please?

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Do a clean (re)install:

  • Download a fresh Firefox copy from http://www.mozilla.com/firefox/all.html and save the file to the desktop.
  • Uninstall your current Firefox version and remove the Firefox program folder before installing that copy of the Firefox installer.
  • Don't remove personal data if you uninstall the current version.
  • It is important to delete the Firefox program folder to remove all the files and make sure that there are no problems with files that were leftover after uninstalling.

If you keep having problems then disable your ant-virus software temporarily during the download and installation of Firefox.


Your bookmarks and other profile data are stored elsewhere (not in the Firefox program folder) and won't be affected by a reinstall, but make sure that you do not select to remove personal data if you uninstall Firefox.