I think I have the latest Firefox version, but keep getting messages about updating it. 1 says something is preventing Firefox from updating securely; another says something is trying to trick Firefox into accepting an unsecure update. What's going on?

The 1st message goes on to say, "Please make sure that you have the latest version of Firefox from http://www.firefox.com." Assuming 4.0.1 is the latest version, it seems this is a bogus message and I haven't clicked on the link.
The 2nd message goes on to say something like, "if this continues [the attempt to trick Firefox into accepting an unsecure update], contact your network administrator."
I started getting the messages on all 4 of our PC's (2 desktops running Windows 7 Home Premium 64-bit, 1 running XP 32-bit, & a laptop running Vista Home Basic 64-bit) after updating to Firefox 4.0 on them. I manually updated to 4.0.1 on all thinking that would stop the messages, but it hasn't.
I loaded & ran free versions of McAfee Stinger, Malwarebytes Anti-Malware, and Super Anti-Spyware programs on all our PCs; each program found & repaired some infected files on each computer, but the messages continue on all.
Thanks for any help you can give.

Apparently this occurs when Firefox has problems with security certificates. There have been a few questions about this. I will try to get advice about this.
Apparently you are using Internet Explorer 9 (From your system details). Do you have Google Updater plugin installed on Firefox ?
(That been implicated in this sort of problem by one poster, and some users with the problem do have Google Updater, but some do not)

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