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Which version of Firefox should I use with Windows 7 Pro?

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I had to uninstall Firefox 5 because I was having too many problems, and things kept disappering. I now want to re-install Firefox, and start anew. Was my problem because I was using 5, and I should use 4?

I had to uninstall Firefox 5 because I was having too many problems, and things kept disappering. I now want to re-install Firefox, and start anew. Was my problem because I was using 5, and I should use 4?

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Installing Firefox on Windows

https://support.mozilla.com/en-US/kb/Installing%20Firefox%20on%20Windows

Check and tell if its working.

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Firefox 4.0 / 4.0.1 aren't supported any longer, Firefox 5.0 was a security & stability update for those versions. Your choice is either Firefox 5.0.1 or 3.6.19.

http://www.mozilla.com/en-US/firefox/

http://www.mozilla.com/en-US/firefox/all-older.html