Windows XP fix firewall that cannot be displayed

Error message:

“Windows firewall settings can not be displayed because the associated service is not running. Do you want to start windows firewall/internet connection sharing service?”

Issues with a corrupted firewall can sometimes be fixed by rebuilding the Windows Management Instrumentation (WMI).

On Windows XP (at least SP2), open cmd and type:

rundll32 wbemupgd, UpgradeRepository

More info here:
http://smallvoid.com/article/winnt-wmi-config.html 

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