Program can't start because AppVIsvSubsystems32.dll is missing

If you start a Microsoft Office application and get an error message that says The program can’t start because AppVIsvSubsystems32.dll is missing, this post may help you. This error affects all the Microsoft Office applications including Word, Excel, PowerPoint, Outlook, etc. This means that when this error occurs, you cannot use any of the Microsoft Office applications.

DLL stands for Dynamic Link Library. It contains code and data that can be used by more than one program simultaneously. Hence, a DLL file helps save disk space by saving the data required by different applications to work properly.

What causes a DLL error?

Windows operating system comes with some pre-installed DLL files. These DLL files are required by the programs to run correctly. If a program does not find the required DLL file, it exits by displaying a DLL error message on the screen. Sometimes when we install a new application or software, it replaces the existing DLL file on the system with a new one. This overwriting of the DLL files causes errors in other applications.

What is AppVIsvSubsystems32 DLL?

Appvisvsubsystems32.dll file is the Microsoft Application Virtualization Client Virtualization Subsystems file and is associated with the Microsoft Application Virtualization.

The error messages you could see are:

Error loading appvisvsubsystems32.dll
There was a problem starting appvisvsubsystems32.dll
The code execution cannot proceed because appvisvsubsystems32.dll was not found
The program can’t start because appvisvsubsystems32.dll is missing from your computer.

The program can’t start because AppVIsvSubsystems32.dll is missing

If you receive this error on your system, the following fixes may help you get rid of it:

Repair Microsoft Office.
Uninstall and reinstall Microsoft Office.

1] Repair Microsoft Office

The first thing that you should do is repair the Microsoft Office application. This process usually takes a few minutes. You can repair Office via Control Panel on your system by following the below-listed steps:

Press Win + R keys on your keyboard to launch the Run dialog box and type Control Panel. After that click OK. This will launch the Control Panel.
Make sure that you have selected Category in the View by mode. If not, set View by mode to Category. You will find this option in the top right corner. Now, click Uninstall a program option under the Programs section. This will show you the list of all installed programs on your system.
Scroll down the list to find Microsoft Office.
Once you find the Office, select it and then click on the Change button. Click Yes if you get a UAC prompt.
Now, select Quick Repair and then click on the Repair button.

Wait till the repair process gets completed. After the completion of the process, launch Microsoft Office and see if the error persists. If you are still getting the same error message, repeat the first four steps described above and select the Online Repair option. The online repair will take a little longer time as compared to the Quick Repair option but fixes all the problems. Please note that for online repair, you will need an active internet connection.

If you still get the same error after online repair, try the next solution.

Read: Fix nvxdsync.exe Application Error.

2] Uninstall and reinstall Microsoft Office

You can uninstall Microsoft Office from the Control Panel. The steps to do so are listed below:

Launch Control Panel.
Click on the Uninstall a program option under the Programs section.
Scroll down the list and select Microsoft Office. Right-click on it and then click Uninstall.
Click Yes in the UAC window and follow the on-screen instructions.
Now, visit the Microsoft website and download the offline installer and install it on your system.
After that, activate it by entering your product key.

Why do some of my DLL files disappear suddenly?

As explained above in this article, one DLL file is shared among multiple programs. Hence, sometimes when you uninstall a program using third-party software, it may delete all the files, including the DLL files. After this, you will receive the DLL missing error in all those programs that use the particular DLL file that has been deleted.

Why do I receive a message Install failed, files in use, or insufficient permission while installing a DLL file?

The message clearly indicates that the DLL file that you are installing is currently in use. This means that the file already exists on your computer and cannot be overwritten. To solve this error, reinstall the program in which you are getting the DLL missing error.

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