Firefox does not open after Windows 7 updates

After Windows 7 updates installed, Firefox 4.0.1 refuses to start. I click on the shortcut, the hourglass (blue circle in Windows 7) pops up for a couple of seconds, then it goes away, and no Firefox.
Chrome and IE work fine.
I have followed the tips on the "Firefox won't start" pages.
In Task Manager, there is a 4,796k Firefox process, which I then end. If I attempt to start Firefox multiple times, I get different processes in Task Manager, of different sizes.
I removed and re-installed Firefox 4.0.1. It made no difference. I even chose to have it delete all my customizations. No luck.
I cannot start Firefox in Safe Mode. When I try, the same thing happens (hourglass, then nothing)
I cannot start the Profile Manager. I created a new user in Windows, logged in as that user, and tried starting Firefox, but the same thing happened. This leads me to believe that it is not a profile issue.
I do not get a crash report.
Thank you for your help!

Which Windows 7 updates were installed? Were these rated as "Critical"?
Microsoft usually releases updates on 'Patch Tuesday' which always takes place on the second Tuesday of the month. That won't take place for another two weeks yet. I'm not aware of any out-of-band updates.

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