Windows XP with Firefox 18.0.1 wont open when upgraded to latest version. Error messages were (1) the procedure entry point PR_SetCurrentThreadName could not be located in the dynamic link library ndpr4.dll (2) the procedure entry point NSSUTIL_EscapeSize could not be located in the dynamic link library nssutil3.dll (3) could not load XPCOM
Ran malware & virus software then removed Firefox via Control panel, then residual folder from Programme files folder and from C:\Documents&Settings\Administrator\Local Folders\ApplicationData\Mozilla. Sourced & installed ndpr4.dl and nssutil3.dll - fresh reinstall firefox several times - this got rid of error message 1 but not 2 or 3 and still can't open Firefox. Any solutions?
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I have this problem and I am using Zone Alarm Extreme Security with Force Field enabled. I found that by clearing the Virtual Cache in Zone Alarm that this problem went away and was able to run firefox again.
Here is a post I found that addresses the issue sort of. http://kb.mozillazine.org/Browser_will_not_start_up#Firefox_does_not_start_after_updating_with_ZoneAlarm_ForceField_enabled
Thank you cregieer I turned of virtual virtualization in Zone Alarm and problem solved. Firefox starts up flawlessly.