I have been using firefox on my desktop with windows xp for years with no problems and suddenly refused to open. The error message reads "unable to locate component. plc4.dll was not found." What does that mean? How do I fix it?
The error message also suggests that I unintall and reinstall firefox, I tried that but it does not fix the problem.
The error message also suggests that I unintall and reinstall firefox, I tried that but it does not fix the problem.
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Which security software (firewall, anti-virus) do you have?
If you use ZoneAlarm Extreme Security then disable Virtualization and reinstall Firefox. Other security software may have similar features to prevent Firefox from updating files properly.
See these pages for a similar issue with corrupted files: