The Problem: Users of Microsoft Teams may encounter an error message stating "ms-teams.exe - Exception Processing Message 0xc0000005 - Unexpected parameters." This issue can disrupt the normal operation of Microsoft Teams, preventing users from accessing the application or causing it to crash unexpectedly.

Problem Analysis: This error typically manifests as a pop-up window displaying the error message when attempting to launch Microsoft Teams or during its operation. The error code 0xc0000005 indicates an access violation, which means the application tried to access a memory location it was not supposed to. This can be due to various reasons, including corrupted files, conflicts with other software, or issues with system memory.

Root Cause: The root cause of this issue can vary, but common causes include:

• Corrupted installation of Microsoft Teams.
• Conflicts with other installed software or system updates.
• Issues with system memory or hardware.
• Corrupted user profile data.

Solution: To resolve the "ms-teams.exe - Exception Processing Message 0xc0000005 - Unexpected parameters" error, follow these steps:

1. Check for System Updates: Ensure that your Windows operating system is up to date.

   • Press Win + I to open Settings.
   • Go to Update & Security.
   • Click on Check for updates and install any available updates.

2. Repair or Reinstall Microsoft Teams:

   • Press Win + I to open Settings.
   • Go to Apps.
   • Find Microsoft Teams in the list and click on it.
   • Select Advanced options.
   • Click on Repair. If the issue persists, click Reset.
   • If resetting does not resolve the issue, uninstall Microsoft Teams and then reinstall it from the official website.

3. Clear Microsoft Teams Cache:

   • Close Microsoft Teams completely by right-clicking the Teams icon in the system tray and selecting Quit.
   • Open File Explorer and navigate to %appdata%\Microsoft\Teams.
   • Delete all files and folders within this directory.
   • Restart Microsoft Teams.

4. Check for Conflicting Software:

   • Disable any recently installed software that might conflict with Microsoft Teams.
   • Temporarily disable antivirus or firewall software to see if they are causing the issue.

5. Run Memory Diagnostic Tool:

   • Press Win + R, type mdsched.exe, and press Enter.
   • Choose Restart now and check for problems to run the Windows Memory Diagnostic tool.
   • Follow the on-screen instructions to complete the test.

6. Create a New User Profile:

   • If the issue persists, create a new user profile to rule out corrupted user data.
   • Press Win + I to open Settings.
   • Go to Accounts > Family & other users.
   • Click on Add someone else to this PC and follow the prompts to create a new user account.
   • Log in with the new user account and check if the issue is resolved.

7. Check for Hardware Issues:

   • Ensure that your hardware components, such as RAM and hard drive, are functioning correctly.
   • Use tools like chkdsk and sfc /scannow to check for and repair disk and system file issues.

     # Open Command Prompt as an administrator
     chkdsk /f /r
     sfc /scannow

By following these steps, you should be able to resolve the "ms-teams.exe - Exception Processing Message 0xc0000005 - Unexpected parameters" error and restore normal functionality to Microsoft Teams.