Running Windows Vista, upgraded to Firefox 4.0 and it won't start.

Firefox 3.6 ran with no problem. Upgraded to 4.0 and it won't start. Uninstalled Firefox and re-installed 4.0 Still won't start. Doesn't appear in task manager, either, when I try to run it.
Help! I'm using IE this afternoon!!!

That is a Flash site, so make sure that you have the Flash player installed and that Flash is working properly.<br />
Also make sure that you do not block JavaScript.
Start Firefox in <u>[[Safe Mode]]</u> to check if one of the extensions or if hardware acceleration is causing the problem (switch to the DEFAULT theme: Firefox (Tools) > Add-ons > Appearance/Themes).
*Don't make any changes on the Safe mode start window.
*https://support.mozilla.org/kb/Safe+Mode

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