Personal Computer Fixes

How To Resolve MozMapi32.dll Errors On Your PC

If you have Mozilla Firefox or Thunderbird, or Netscape installed on your computer, you may have experienced the MozMapi32.dll error. The MozMapi32.dll file is created by Mozilla applications and is an important feature of Mozilla Thunderbird. However this file can conflict with other software and devices. This causes errors in the updating and the use of these applications. This can easily be fixed by following the steps below.

What Are MozMapi32.dll Errors?

The errors come in a variety of forms such as:

C:\Program Files\Mozilla Thunderbird \mozMapi32.dll. Click retry or cancel the installation


Destination Folder Access Denied. You need permission to perform this operation.

There is a known conflict between Logitech webcams and Mozilla applications. This causes either of these errors to appear. It could be as you try and uninstall Thunderbird via the Add/Remove Programs in Vista’s control panel, that one or more of these errors appear. There are quick work arounds around this problem whilst Mozilla or Logitech release an upgrade which should fix this conflict. To find out these, carry out the steps below.

How To Fix MozMapi32.dll Errors

Step 1 – Disable Logitech Webcam

Sometimes the Logitech webcam software conflicts with the Thunderbird application and this can be resolved by this easy work around:

  1. Find the “Quickcam” icon in the notification tray (next to clock)
  2. Right click on the icon and click exit.

Now you should be able to update or uninstall the Thunderbird application as the Logitech software has been suspended and so the application has been prevented from accessing any files that Thunderbird may want to access at the same time, causing a conflict. If this solution did not work, carry on to the next step.

Step 2 – Rename the MozMapi32.dll file

Renaming the MozMapi32.dll file means that the Logitech software cannot attempt to access it and cause a conflict. Once you have changed the file name, it should allow Thunderbird to update as a new MozMapi32.dll file will just be installed instead. To carry out this step, follow these:

  1. Go to My Computer
  2. Locate the folder C:\Program Files\Mozilla Thunderbird (or the install folder for Mozilla Thunderbird).
  3. Browse to the file mozmapi32.dll
  4. Right click and rename it “MozMapi32(old).dll“.

Since the file has been renamed, the Logitech software cannot find it on it’s own. A new MozMapi32.dll will be installed when Thunderbird is updated and therefore MozMapi32(old).dll will not be needed. If this step does not work, carry on to the next step

Step 3 – Disable / Uninstall Quickcam

Since Logitech Quickcam is the main source of these problems, disabling its use or uninstalling the program will mean that Thunderbird can be updated without the Quickcam software interfering with it. To disable Quickcam, look back at Step 1. If this failed, it would be best to uninstall the Quickcam to identify whether this was the actual cause. Make sure you follow the normal route for this, by clicking onto Control Panel and Add/Remove Programs (Uninstall a program on Windows 7). Locate the Logitech Quickcam software and follow the uninstall procedure correctly. This should eleviate the problem as there would now be no way of the software conflicting with Thunderbird. To determine whether it has been uninstalled correctly, go to the Quickcam software folder and make sure it has been deleted.

If this step did not work, carry on to the next step.

Step 4 – Clean Out Viruses

– Download This Virus Scanner

Antivirus programs are software tools which scan through your PC and remove any of the viruses or malware infections that are on your system. It’s often the case that viruses will infect various DLL files on your computer and then cause them to be unreadable to your PC. To ensure this is not happening on your computer, you should try using an antivirus program to scan through your system and remove any of the infections that cause all these errors. You can download our recommended antivirus program from the link above, but there are a large variety of programs available.

Step 5 – Clean Out The Registry

– Download This Registry Cleaner

It’s often the case that registry errors cause the nvcpl.dll error to appear. The “registry” is a central database which stores all the settings, information and options for your computer, and is where Windows keeps many vital settings that it requires to run. It’s often the case that a lot of registry settings become damaged and corrupted, leading your PC to take longer to run, making it run slower and with a lot of errors. To fix this problem, you should use a ‘registry cleaner’ to scan through your PC and fix any of the damaged or corrupt settings that are inside it. You can see our recommended registry cleaner below:

» Download DLL Repair Tool


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