FF4 won't open after installation after 2 tries at rebooting computer.

Installed FF4 and rebooted as directed. After restart got message "Your computer must be restarted to complete a previous upgrade of Firefox." Can't uninstall via control panel because I get the same message.

Hi:
You can start here:
COMPRESSOR TROUBLESHOOTING
http://docs.info.apple.com/article.html?artnum=302845
Hope that helps !
  Alberto

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