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I've download Firefox 4. How do I install it?

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I have a 10 year old tower running Windows XP. I've downloaded Firefox 4 but can't find an ICON to install it with. How do I install Firefox 4 after I've downloaded it?

I have a 10 year old tower running Windows XP. I've downloaded Firefox 4 but can't find an ICON to install it with. How do I install Firefox 4 after I've downloaded it?

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