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I have Windows XP Pro and it won't launch Firefox 4. Will anything help?

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I installed Firefox 4 but it won't run with Windows XP Pro. It just never launches. Eventually I have to shut it down with the Windows task manager. My computer thinks it is running even though the browser window never appear. I have tried uninstalling the program and reinstalling - same thing.

I installed Firefox 4 but it won't run with Windows XP Pro. It just never launches. Eventually I have to shut it down with the Windows task manager. My computer thinks it is running even though the browser window never appear. I have tried uninstalling the program and reinstalling - same thing.