Fix: Nexus Mod Manager wont Launch

Nexus Mod Manager is the ultimate tool for PC users who want to mod their games to the absolute limits as it makes the whole process seem almost automatic. The tool is quite popular as well so this error has attracted some attention.

The problem consists of the fact that Nexus Mod Manager won’t open under any circumstances no matter which method you use to open it. There are several causes for this occurrence and several solutions so make sure you try them all out before giving up. Good luck!

Solution 1: A Method Presented by the Majority

This almost weird fix originated on Reddit but it will only be helpful if certain criteria have been met. In this section of the article, we will first see if this solution is able to help and then we will try to look for the solution which should solve the problem for you.

1. Open your Start Menu or click on the search button next to it in order to search for “Event Viewer”. Click on the first option that pops up.
2. You should see a navigation menu on the left side of the Event Viewer window. Click on Windows Logs and select the Application icon. In the center of the Event Viewer window, you will see a bunch of entries and most of them should carry the label Information.

3. Try to look for entries whose date of creation corresponds with the time when you tried to launch the Nexus Mod Manager. If you are uncertain about that, try opening Nexus Mod Manager now and click on the refresh button at the right side of the window where three new entries should appear.
4. You should see (in chronological order) entries first from “.NET runtime”, then “Application Error”, and finally “Windows Error Reporting”. Select the entry from “.NET runtime”. At the bottom of the window, you will see a “General” and a “Details” tab. In the general tab, there will be a text box detailing the error. The application should be NexusClient.exe. If it isn’t, look for one that is.
5. Under that, there is a Framework Version, Description, and Exception Info. If Exception Info reads “System.Xml.XmlException”, this solution may be helpful to you.

Now that we know this solution might seem helpful to your problem, it’s time to try and solve it by implementing the next series of steps which are much easier to deal with than the ones above. Good luck!

1. Navigate to the folder displayed below by opening File Explorer on your PC, clicking on This PC and following the location:

C:\Users\yourusername\AppData\local\Black_Tree_Gaming

2. If you are unable to see the AppData folder, you may need to turn on the option that enables you to view hidden files and folders. Click on the “View” tab on File Explorer’s menu and click on the “Hidden items” checkbox in the Show/hide section. File Explorer will show the hidden files and will remember this option until you change it again.

3. Backup the contents of the Black_Tree_Gaming folder to another location and delete everything you locate inside. You will now need to relaunch the Nexus Mod Manager client. If it opens, make sure you let it look for games and make sure you point to all folders it was using beforehand.

Solution 2: Reinstall Nexus Mod Manager

As the tool is mostly community-developed, bugs like this one can occur, especially when the purpose of the program is to manage files that change the source files of other programs (video games). That it’s why a complete reinstall is sometimes a must.

Uninstalling the game:

1. First of all, make sure you are logged in with an administrator account as you won’t be able to delete programs using any other account.
2. Click on the Start menu and open Control Panel by searching for it. Alternatively, you can click on the gear icon in order to open settings if you are using Windows 10.
3. In Control Panel, select to View as: Category at the top right corner and click on Uninstall a Program under the Programs section.

5. If you are using the Settings app, clicking on Apps should immediately open a list of all installed programs on your PC.
6. Locate NMM in Control Panel or Settings and click on Uninstall.
7. NMM’s uninstall wizard should open and prompt you with a choice.
8. A message will pop up asking “Do you want to completely remove Nexus Mod Manager for Windows?” Choose Yes.
9. Click Finish when the uninstalling process finishes.

You can reinstall Nexus after you restart your computer by opening its main website in a browser and clicking the download button. Follow the instructions on the screen to install it again and make sure you reinstall all mods you had. Check to see if it’s able to launch now.

Note: Try installing Nexus Mod Manager in any other folder besides Program Files or Program Files (x86). This should help solve the problem as it appears that Windows 7 and Windows 8 users struggle with installing to these folders. Good luck!

Solution 3: Use System Restore

If you have changed certain settings or installed suspicious programs on your computer, they may interfere with Nexus Mod Manager and your safest bet is to use System Restore to restore your computer back to a point in time where these issues didn’t occur. Follow the steps below in order to do so:

1. First of all, let’s turn on the System Restore setting on your PC.
2. Search for System Restore using the Search button in your Windows 10. From there, click on Create a restore point.

3. A System Properties window will appear and it will display the required settings. Inside this window, open Protection Settings and make sure that protection is enabled on your Local Disk C (System Drive).
4. If it is disabled, select that disk and click on the Configure button to enable protection. You should also allocate the maximum disk space for system protection. You can set it to whatever value you want as long as that size is at least a couple of gigabytes. Click on Apply and OK afterward to apply the settings.
5. Now, the system will create a restore point automatically whenever an alteration happens inside your Windows.

After you have enables it successfully, let’s get to business and revert the changes to your PC. Make sure you take note of some important documents and apps you have created or installed in the meantime just to be safe.

1. Search for System Restore using the Search button next to the Start menu and click on Create a restore point. Inside the System Properties window, click on System Restore.

2. Inside the System Restore window, select the option called Choose a different restore point and click the Next button.
3. Select a particular restore point you saved before manually. You can also select any restore point available in the list and hit the Next button to initialize the restoration process. After the process is done, you will be reverted to the state your computer was in at that period in time. Check to see if the Nexus Mod Manager can be opened now.

Solution 4: Check to see if it was Blocked for Security Reasons

As the purpose of the tool is to change some video games completely including their source files, the Windows security team consisting of Windows Defender, Windows Firewall, UAC, etc., may see it as a threat and block it on security grounds, which will cause this problem and it won’t be able to start. Solve this problem by following the steps below:

1. Right-click the Nexus Mod Manager icon on the Desktop if you have one and choose Open File Location. If you don’t have a Desktop shortcut, locate it in the Start menu, right-click on it and choose the Open File Location option.

2. After the folder opens, right-click on the client file which should be automatically selected when you enter the folder and choose Properties. You may see a text saying about how it was blocked for security reasons in the Properties window. Just click unblock and Apply the changes. Restart your computer and check to see if the problem is solved.