Join the AMA (Ask Me Anything) with the Firefox leadership team to celebrate Firefox 20th anniversary and discuss Firefox’s future on Mozilla Connect. Mark your calendar on Thursday, November 14, 18:00 - 20:00 UTC!

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

Èròjà atẹ̀lélànà yii ni a ti fi pamọ́ fọ́jọ́ pípẹ́. Jọ̀wọ́ béèrè ìbéèrè titun bí o bá nílò ìrànwọ́.

Why is there a problem with Setup.exe when upgrading from 2.0 to 3.6.3?

  • 2 àwọn èsì
  • 2 ní àwọn ìṣòro yìí
  • 14 views
  • Èsì tí ó kẹ́hìn lọ́wọ́ Shawn

more options

I am trying to upgrade Firefox on a laptop that currently has 2.0. I downloaded 3.6.3 and opened setup. I get an error message indicating that setup cannot run setup.exe. It advises I restart my computer. When I do, it does no good. Please advise.

This happened

Just once or twice

== I tried to upgrade from 2.0 to 3.6.3.

I am trying to upgrade Firefox on a laptop that currently has 2.0. I downloaded 3.6.3 and opened setup. I get an error message indicating that setup cannot run setup.exe. It advises I restart my computer. When I do, it does no good. Please advise. == This happened == Just once or twice == I tried to upgrade from 2.0 to 3.6.3.

All Replies (2)

more options
 You have an old version of Windows installed. See http://www.mozilla.com/en-US/firefox/system-requirements.html
more options

Firefox 2.0.0.20 is the last ever version of Firefox for Win98 / SE / ME.

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/