After investigating this issue, it turns out that there are several different underlying causes that might be producing the .NET Runtime Error 1026. Here’s a list of potential culprits that might cause this error: Now that you know every scenario that might be the underlying cause of this issue, here’s a list of methods that other affected users have successfully used to get to the bottom of this issue:
Method 1: Clean Boot Procedure
According to most documented cases, this issue can most likely occur due to some kind of conflict between two 3rd party programs or between a 3rd party program and a native Windows process. This is way more likely if you’re only noticing new instances of the .NET Runtime Error 1026 error popping up when you attempt to open a 3rd party application. If this scenario is applicable, you can isolate and identify the culprit by starting your computer into clean boot mode and seeing if the issue still occurs. This operation will ensure that your computer boots up in a mode that disallows the running of any 3rd party service, process, or startup item. If you boot your computer into a Clean Boot state and you see that the issue stops occurring, you can go ahead and systematically re-enable every process and startup item and do regular restarts until you manage to pinpoint the culprit. In case the same .NET Runtime Error 1026 error is still occurring even after you boot your PC into the clean boot, move down to the next potential fix below.
Method 2: Running the .NET Repair Tool
If a clean boot didn’t work for you, our recommendation is to proceed with a series of troubleshooting steps that will allow you to fix any underlying issues with the .NET redist packages that are currently installed on your computer. Several affected users that were also struggling with this issue have reported that they finally managed to prevent new instances of the .NET Runtime Error 1026 error from occurring by running the .NET Framework Repair Tool – This tool will automatically scan your computer and fix any .NET dependencies that might be creating issues. If you haven’t tried running the .NET Repair tool, follow the instructions below for step by step instructions on doing so: If you already ran the .NET Framework Repair utility and you’re still seeing this kind of issue, move down to the next potential fix below.
Method 3: Renaming the Launchpad.exe (if applicable)
As it turns out, you can expect to see this error due to a new Windows Update that ended up breaking an existing Windows 10 functionality. Although the .NET Runtime Error 1026 error is not really indicative of this potential culprit, several affected users have confirmed that they were able to get Full Control permissions for the Users directory and renaming the Launchpad.exe to something different in order to prevent Windows from using it. Note: If you have multiple users account on this computer, you need to do this for every user present inside the C:\Users\ directory. If you haven’t tried this method yet, follow the instructions below to obtain Full Control permissions in the Users directory and rename the main Launchpad executable: Update: As far, this particular fix was only confirmed to work for Windows 10. If you’re still spotting new instances of the .NET Runtime Error 1026, move down to the next potential fix below.
Method 4: Reinstalling Windows Media Player
If you’re encountering this error while attempting to launch an application or game that needs to make use of a Windows Media Player dependency, you might be able to fix this issue by reinstalling the local installation of Windows Media Player. Typically, you will be able to spot if this scenario is applicable by checking the Event ID log file. If it contains mentions of Microsoft.Xna.Framework.Media.MediaQueue.Play or something different, this fix will most likely allow you to fix the issue. Several affected users have confirmed that they were able to prevent the apparition of new instances of the .NET Runtime Error 1026 error, by using the Programs and Features menu to essentially reinstall the entire Windows Media Player component. If you haven’t tried doing this yet, follow the instructions below: If the issue is still not resolved, move down to the next potential fix below.
Method 5: Running SFC and DISM Scans
If none of the methods above have worked for you, it’s time to start troubleshooting for some kind of corruption affecting your system files that’s affecting the .NET framework. if the .NET Framework repair tool was not effective in your case, you should proceed by running a couple of built-in utilities that every recent Windows version has (SFC and DISM). SFC (System File Checker) and DISM (Deployment Image Servicing and Management) are two tools capable of effectively identifying corrupted system files and replacing them with healthy equivalents. Even though these 2 tools share some similarities, our recommendation is to run both in quick succession in order to improve your chances of fixing the corrupted system files. Doing an SFC scan is an ideal place to start since it’s an entirely local tool that will not require you to have a reliable internet connection. Note: After starting this procedure, it’s important to avoid closing the elevated CMD window even when the utility looks like it froze (this tends to happen with PC’s using traditional HDD). Wai patiently until the process is complete as interrupting the operation might cause logical errors on your HDD. Once the SFC scan is complete, reboot your computer and deploy a DISM scan once the next startup is complete. Note: This utility uses a sub-component of Windows Update to download healthy components to replace corrupted instances of system files. Because of this, you need to make sure that you have reliable Internet. Once the DISM scan has been completed successfully, restart your computer and check Event Viewers to see if you can spot new instances of the .NET Runtime Error 1026. In case the same issue is still occurring, move down to the next potential fix below.
Method 6: Refresh every Windows Component
If none of the methods above have worked in your case, it’s very likely that you’re dealing with some kind of underlying system corruption issue that is affecting your .NET framework that no built-in utility is able to fix. If this scenario is applicable, one of the last things you can do is to make sure that you are essentially refreshing every Windows component in order to eliminate any type of corruption that might be responsible for this issue. When it comes to doing this, there are 2 procedures that you should consider using:
Repair install (in-place repair) – This is the recommended procedure if you are not short of time and you want to go for a method that will allow you to preserve your personal files present on the OS drive. Doing a repair install procedure will require you to use compatible installation media. But the major advantage is that you get to keep your installed applications, games, personal media, and even some user preferences.Clean install – If you’re looking for a quick fix and you don’t have important data on your OS drive (or you have already backed it up), the procedure that makes the most sense is a clean install. This will not require you to use installation media (you can start it directly from the GUI menu of Windows).
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