Another reason the can cause the Class not registered error are the corrupted Antivirus software. Examples of such antivirus software are Panda, AVG, etc. if the user is encountering the error due to this then he or she can temporarily disable the antivirus software and then enable it again. However, if the antivirus software does not have that option, then the user might have to delete the software.

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It is cautioned that the user must follow this step only when he or she has the product key and the installation package. Another reason behind the error can be due to the antivirus software that a user might be having in his or her computer. The antivirus software sometimes gets corrupted by a virus or malware and deletes some antivirus files along with the system files that it may have been deleting and cleaning. Thereby, causing the error of explorer.exe class not registered to appear. The reason behind such an error is because at certain times the shared DLL file becomes unregistered due to various reasons.

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Problems with the file may be caused by spyware or malware infiltrating the application as well as viruses affecting the program. In addition, some firewalls and anti-virus programs may interfere with Firefox if it is not considered a "trusted" application by the firewall software. The Xul.dll file is a dynamic link library file that is an important component of the Mozilla Firefox browser. The file controls the Internet browsing speed and is on every version of Firefox. If the file is disabled, it could crash your browser, which may be debilitating to a small company that relies on the Internet to conduct their business.

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Luckily the issue is simple to fix with a reinstall of the file. On the next window, you will see a list of installed programs on your computer. You might need to close your browser to complete the removing process.

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After this, the windows are unable to link the file with the program that the user wants to run. The xul.dll file is essential for Firefox to work and automatically launches when you open their browser. Anything that interferes with the file causes the entire Firefox application to stop working.

Now, from the list of all installed programs, find Amazon Assistant, right-click on it and select change. If this occurs, you’ll have to delete the index.dat file and restart your computer. Then you’ll be able to download files correctly again. In my work as an IT professional, I’ve recently been encountering a whole swathe of “iertutil.dll” errors on Windows XP machines. I believe this issue is also affecting some Windows Vista installations, however the solutions below are only tested on XP cannot find msvcr120.dll.