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Why does my upgraded version of FF keep reverting back to an older version?

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For the past month, I have repeatedly installed FF ver. 3.6.19. It takes and everything is fine when the window is initially open. As soon as I close out of FF and open it back up again, it reverts back to 3.6.15. This happens when I close out the window or I restart my computer. I have uninstalled FF about 4 times now and just installed 3.6.19 but it keeps reverting to 3.6.15. However, in the Control Panel, under Uninstall Programs, it is listed as 3.6.19.

I also frequently get a pop box that tells me to upgrade to 3.6.18. I click ok but it just keeps "scanning" and no update ever takes place.

This problem actually started when I upgraded to FF ver. 5. I had version 5 on my computer for a few days and then it somehow downgraded itself to 3.6.15. I have not be able to successfully upgrade FF since then.