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I have downloaded Firefox 4.0 several times and after a short amount of time (days) it reverts back to 3.6.16. Why does it happen and how do I prevent it from happening again?

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The Firefox 4.0 on my laptop reverts back to 3.6.16. This has happened several times. Why does this happen and/or how do I prevent it from happening again?

The Firefox 4.0 on my laptop reverts back to 3.6.16. This has happened several times. Why does this happen and/or how do I prevent it from happening again?