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setup causes an invalid page fault in module Setup.exe

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When trying to upgrade from Fire Fox 1.06 I get a message: setup causes an invalid page fault in module setup.exe at 0167:0040351e.

When trying to upgrade from Fire Fox 1.06 I get a message: setup causes an invalid page fault in module setup.exe at 0167:0040351e.

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Firefox 2.0.0.20 is the last ever version of Firefox for Win98 / SE / ME.
Get it from here:
ftp://ftp.mozilla.org/pub/firefox/rel.../en-US/

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/