Cannot uninstall Mozilla Firefox 4.0.1, downloaded two days back using the control panel or the Revo Uninstaller.

I had downloaded Mozilla Firefox 2 days back, overriding the existing version 3.6.13.
But I find the new version rather unusable. I am very familiar with the FF 3.6 version, which I have been using over 2 years. Hence I would like to revert back to the earlier version 3.6.13.
Mozilla Help informed that I should first uninstall version 4.x and then reinstall the earlier version.''But I am unable to find the version 4.x, either through the Control Panel or through the program Revo Unistaller'''. '''How can I proceed to restore back the earlier version 3.6?'''

'''@jef001 :'''
Thanks for your helpful answer. However, now after a few trials and errors in using FF 4.0.1, I have got the hang of using the same fairly well and I shall continue with the same .
'''@Editor:'''
Thanks for your comments . I think that my wording in the question has caused some ambiguity. Actually, I updated using the Mozilla FF Help menu only. I was trying to '''uninstall''' the new version using the Revo Uninstaller, as I did not find the FF 4.0.1 in the Windows Uninstall List, and not '''installing''' it through Revo Uninstaller. However, my above reply to jef001, should clear up the issue of my continuing with FF 4.0.1 .
- - arasan77

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