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xul.dll & xpcom.dll not loading continuous problem even after re-installing as advised on help pages making Firefox unreliable.

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Peterwei
Peterwei
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Initially Firefox would not start saying that the xul.dll could not be read by windows or was corrupt followed immediately by xpcom.dll could not load. Researched your website and re-installed Firefox as per instructions, deleting the Mozilla directory in Program FIles as directed. This worked and Firefox came up and worked fine but after I closed it and shut down for the night and started up the next morning, the same problem appeared. I once again re-installed Firefox [v27.01] as instructed and it worked fine but once again this morning it failed to start with the same error messages. This is now a recurring problem making the program unreliable and forcing me to use a competitor's product, even to request this support. Can you help? Peter W.

Initially Firefox would not start saying that the xul.dll could not be read by windows or was corrupt followed immediately by xpcom.dll could not load. Researched your website and re-installed Firefox as per instructions, deleting the Mozilla directory in Program FIles as directed. This worked and Firefox came up and worked fine but after I closed it and shut down for the night and started up the next morning, the same problem appeared. I once again re-installed Firefox [v27.01] as instructed and it worked fine but once again this morning it failed to start with the same error messages. This is now a recurring problem making the program unreliable and forcing me to use a competitor's product, even to request this support. Can you help? Peter W.

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cor-el
cor-el
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Which security software (firewall, anti-virus) do you have?

Boot the computer in Windows Safe mode with network support (press F8 on the boot screen) as a test to see if that helps to (re)install Firefox properly.