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Error message "ISWUIlib.dll missing each time I start Firefox

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This error comes up each time I open Firefox. I go on and Firefox works fine.

This happened

Every time Firefox opened

This error comes up each time I open Firefox. I go on and Firefox works fine. == This happened == Every time Firefox opened

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Uninstall and reinstall ZoneAlarm Forcefield. That should fix the problem.

See this thread.