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Installed 4.0.1 over 3.6 Now Firefox does not run

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Using Windows XP, updated Java to the latest version, am running Firefox V4.0.1 in 98/Me compatibility mode. Windows Task Master/Processes reports that Firefox IS running, and consuming 50% of the CPU cycles, but nothing can be sen on the screen. Help!

Using Windows XP, updated Java to the latest version, am running Firefox V4.0.1 in 98/Me compatibility mode. Windows Task Master/Processes reports that Firefox IS running, and consuming 50% of the CPU cycles, but nothing can be sen on the screen. Help!

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Windows 98/ME doesn't meet the minimum system requirements to run Firefox 4. See http://www.mozilla.com/en-US/firefox/system-requirements.html

If you go to Help | About Firefox, which version does it say you have installed?