What do I do when I try to open Fifrefox 4 & get the message: The procedure entry point NS_SetDllDirectory could not be located in the dynamic link library xul.dll?

2 days ago, I got a message about upgrading to Firefox 4.0. I didn't do it immediately, due to lack of time. Later that day, I tried to open Firfox & got the message: Firefox can't start because xul.dll is missing. Reinstall the program to fix this. I tried several times to open Firefox & got the same result. I tried rebooting. Same result. So I opened Internet Explorer & went to the Firefox website & followed the instructions to download Firefox 4. After that, I used it last night & left my laptop hibernating last night, then continued to use it this morning. Then I closed Firefox. When I next tried to reopen Firefox, I got the new message: The procedure entry point NS_SetDllDirectory could not be located in the dynamic link library xul.dll. Again, I can only access the internet with Internet Explorer. Also, I have a done a good many Windows updates over the last 2 days as well. What can I do to get Firefox to open? Thank you for your help.

This is what I did to resolve this problem. First, I uninstalled Firefox 4 & removed the Firefox folder left behind. I made sure to NOT select the option to delete personal information. Next, I backed up all of the important files on my computer. Next, I upgraded my Windows 7 to Service Pack 1, which was pending in my updates folder. Then, I went to Mozilla's website & downloaded Firefox 4 again, making sure to select only the Firefox browser and not Thunderbird too. http://www.mozilla.org/ When prompted to close any open programs, I closed Internet Explorer (which I had used to get to the Mozilla website) and I disabled my Norton anti-virus. I then completed the installation & it works just fine now. It loaded all of my personal data, such as bookmarks, it remembered my password, etc. It's fine for my needs, as I'm not a heavy user of special add-ons & plug-ins. Some of those may not work yet with the new version.

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