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I keep getting a SETUP.EXE error message when downloading firefox 3.6.10

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Each time I have attempted to open firefox 3.6.10 after downloading is completed I receive an error message that states "Setup has caused an error in SETUP.EXE, setup will close now. Try restarting your computer and try again". I have done this for each of my last three sessions, what can I do.

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Firefox 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.