This site will have limited functionality while we undergo maintenance to improve your experience. If an article doesn't solve your issue and you want to ask a question, we have our support community waiting to help you at @FirefoxSupport on Twitter and/r/firefox on Reddit.

Search Support

Avoid support scams. We will never ask you to call or text a phone number or share personal information. Please report suspicious activity using the “Report Abuse” option.

Learn More

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

more options

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

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

All Replies (3)

more options

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/

more options