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I downloaded Firefox setup 3.6.17 -- when I ran it, after unpacking all files, I got an error, "Setup caused a page fault error" How can I complete the upgrade?

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I am trying to upgrade from Firefox version 1.5 on a Windows 98 desktop computer. My system will not accept the Firefox 4.0 upgrade. I downloaded the 3.6.17 upgrade setup.exe and ran it. It unpacked 100% then dsplayed an error message "Program has performed an illegal operation" The Detail button displayed "Setup caused an invalid page fault in module Setup.exe at 017f.0040351e.

I am trying to upgrade from Firefox version 1.5 on a Windows 98 desktop computer. My system will not accept the Firefox 4.0 upgrade. I downloaded the 3.6.17 upgrade setup.exe and ran it. It unpacked 100% then dsplayed an error message "Program has performed an illegal operation" The Detail button displayed "Setup caused an invalid page fault in module Setup.exe at 017f.0040351e.

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