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Article ID: 303067 - Last Review: March 10, 2006 - Revision: 4.2
You cannot debug a managed application in Visual Studio .NET if Windows was started in debug mode
This article was previously published under Q303067
When you try to debug a managed application (one that makes
use of the .NET Framework) with Visual Studio .NET software, you may receive
the following error message:
Error while trying to run
project: Unable to start debugging.
Unable to start program
your project name
Debugging isn't possible
because a kernel debugger is enabled on the system.
-or-
The debugger is not properly installed. Run setup to
install or repair the debugger.
: The second error message may have other causes and resolutions.
This problem happens if Windows was started in debug mode
on the system. This stops the Visual Studio .NET debugger from debugging
managed applications.
To determine whether your system was started
in debug mode, see the following Microsoft Knowledge Base article:
244876Â
(http://kbalertz.com/Feedback.aspx?kbNumber=244876/
)
How to determine if Windows is started in Debug mode
There are two ways that you can resolve this problem. Do
either of the following:
- Resolution 1
- Right-click the Project Name in Solution Explorer, and then click Properties.
- In the left pane of Properties, click to select Configuration Properties.
- Click to select Debugging.
- In the right pane, click to select the Unmanaged code debugging check box.
- Resolution 2
- In Microsoft Notepad, open Boot.ini, which is located
in the System Drive folder (usually C:\). This file
may be hidden and read-only, so you may have to use dir
/ASH to find it.
- Remove all of the following switches, if found in the
file:
- /debug
- /debugport
- /baudrate
- Restart the computer, start Visual Studio .NET, and
then debug.
For more information, click the following article number to view the article in the Microsoft Knowledge Base:
170756Â
(http://kbalertz.com/Feedback.aspx?kbNumber=170756/
)
Available switch options for Windows NT Boot.ini file
APPLIES TO
- Microsoft Visual Studio .NET 2002 Professional Edition, when used with:
- Microsoft Windows 2000 Standard Edition
- the operating system: Microsoft Windows XP
- Microsoft Windows NT 4.0
- Microsoft .NET Framework Software Development Kit 1.0 Service Pack 2
| kberrmsg kbbug kbide kbdebug kbprb kbvs2002sp1sweep KB303067 |
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