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I installed and reinstalled Firefox 4.01 several times, but when I open it, Firefox 3.6 opens instead.

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I downloaded and installed Firefox 4.01. I even uninstalled Firefox 3.6 and reinstalled 4.01. When I click the finish button 4.01 opens, but once I close the browser and then open it from my start menu or desktop icon 3.6 opens instead. What's the problem?

I downloaded and installed Firefox 4.01. I even uninstalled Firefox 3.6 and reinstalled 4.01. When I click the finish button 4.01 opens, but once I close the browser and then open it from my start menu or desktop icon 3.6 opens instead. What's the problem?

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What makes you think that you don't have Firefox 4.0.1 installed?
This forum shows you used Firefox 4.0.1 to post here - different PC?

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When I open Mozilla the page days I'm running 3.6.13 and recommends I download 4.0

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Please provide a screenshot of that message.

https://support.mozilla.com/en-US/kb/Adding+screenshots