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How to revert to firefox 3.6? Firefox 4 does not work with plugins

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I have updated to firefox 4. Several plugins do not work such as McAfee Security but Windows Media Player plugin does not work. I have uninstalled firefox 4 and Media Player plugin. I reinstalled everything but the Media Player plugin failed again. The screen just remains blank. The blank screen occurs when testing Media Player using the Mozilla test link. I would like to go back to firefox 3.6 since I cannot use firefox 4 with all the problems but I cannot find any archived versions.

I have updated to firefox 4. Several plugins do not work such as McAfee Security but Windows Media Player plugin does not work. I have uninstalled firefox 4 and Media Player plugin. I reinstalled everything but the Media Player plugin failed again. The screen just remains blank. The blank screen occurs when testing Media Player using the Mozilla test link. I would like to go back to firefox 3.6 since I cannot use firefox 4 with all the problems but I cannot find any archived versions.

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If downloaded files get corrupted then you need to check your Anti-virus software.

Firefox closes the file during the download after saving each chunk of data to prevent dataloss in case of problems and that may cause anti-virus software to think that the download has finished.
If real-time scanning is enabled then the anti-virus software can start scanning and locking the file prematurely and make it impossible for Firefox to continue and finish the download process.

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