FIX: Just-In-Time Debugger An unhandled win32 exception occurred in Outlook.exe, or in Another program. (Solved)

In this tutorial you 'll find instructions to stop the Just-In-Time Debugger dialog box from appearing. The dialog box "Just-In-Time Debugger: An unhandled win32 exception occurred in Outlook.exe" (or at any other program), appears because the reported application in the dialog box, cannot start.

The 'Choose Just-In-Time Debugger" dialog box, gives you the option to launch Visual Studio to debug the error. But, if the Visual Studio is not installed or it cannot debug the error, the reported application crashes and closes.

If you want to prevent the "Choose Just-In-Time Debugger" dialog from appearing, then you have to disable the Just-In-Time Debugger, by following the instructions below.

How to Stop the Just-In-Time Debugger. *

* Note: If the "Just-In-Time Debugger – An unhandled win32 exception occurred…" dialog box appears when launching Outlook, then, before proceeding to the methods below, apply the following actions:

1. Repair the Outlook PST data file and then open Outlook.

2. Repair the Office installation.

Method 1. Modify the Data Execution Prevention (DEP) to Default Settings.

1. Right click on My PC and select Properties.
2. Click Advanced system settings on the left.

3. At 'Advanced' tab click Settings at 'Performance' section.

4. At 'Performance Options' select the Data Execution Prevention tab.
5. Choose Turn On DEP for Essentials for Essentials Windows programs and services only and click OK.

6. Restart your PC and check if the Just-In-Time Debugger dialog box has stopped appearing.

Method 2. Disable Just-In-Time Debugger in Visual Studio.

If you have the Visual Studio installed, then proceed and disable the Just-In-Time Debugger in Visual Studio. To do that:

1. navigate to Control Panel -> Programs and features.
2. Highlight the Visual Studio and click Change.

3. On a new opened window choose the Individual Components tab.
4. Uncheck the Just in Time Debugger and click Modify.

Method 3. Disable the Just-In-Time Debugger from Registry.

1. Open Registry editor. To do that:

1. Press Windows + R keys to open the run command box.
2. In the "Open" box, type: regedit & click OK.

2. Find and Delete the following registry entries (in bold letters):

• HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\.NETFramework\DbgManagedDebugger
• HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\AeDebug\Debugger

3. If you have 64-bit Operating System, delete also the following registry entries (in bold letters):

• HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\.NETFramework\DbgManagedDebugger
• HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\Microsoft\Windows NT\CurrentVersion\AeDebug\Debugger

4. Close Registry Editor and restart the computer.
5. After restart the "Just-In-Time Debugger – An unhandled win32 exception occurred…" will disappear.

* Note: If the Just-In-Time Debugger dialog box, still appears, navigate to Control Panel -> Programs and features and uninstall the Microsoft Visual Studion 2010 Shell (Isolated).

That's all folks! Did it work for you?
Please leave a comment in the comment section below or even better: like and share this blog post in the social networks to help spread the word about this solution.

• Author
• Recent Posts

Konstantinos Tsoukalas

Konstantinos is the founder and administrator of Repairwin.com. Since 1995 he works and provides IT support as a computer and network expert to individuals and large companies. He is specialized in solving problems related to Windows or other Microsoft products (Windows Server, Office, Microsoft 365, etc.).

Latest posts by Konstantinos Tsoukalas (see all)

• Top Windows 11 Issues and Solutions for April 2026: A Comprehensive Guide. - April 29, 2026
• FIX "BitLocker Recovery" Loop after installing KB5083769 - April 27, 2026
• Ultimate CoD Warzone Settings for Enhanced FPS and Visibility - April 9, 2026