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I get this error message when trying to upgrade to the latest version of Firefox, Setup has caused and error in SETUP.EXE.

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Upgrading from Firefox version 2.0.0.20 to the latest version, 3.6.8. I using Windows ME.

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Firefox 2.0.0.20 is the last ever version of Firefox for Win98 / SE / ME. http://www.mozilla.com/en-US/firefox/system-requirements.html

You can try KernelEx to get Firefox 3+ to work, but it would be very slow with an old PC of less than 750Mhz. http://sourceforge.net/projects/kernelex/

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Thank you!