This article was previously published under Q121434
Windows NT allows you to specify a post mortem debugger for unhandled Usermode exceptions. A general protection (GP) fault message is one of the manyexamples of a User mode exception. This allows you to see what went wrongin the code by examining where the program caused the fault, as well as thecondition of registers, memory, and the stack.
By default, Windows NT used a 32-bit version of Dr. Watson as a post mortemdebugger. The Dr. Watson log obtained from application users can be usefulto the developers of the application in determining the cause of failure.
When the Win32 SDK is installed, the default post mortem debugger ischanged to the kernel debugger. When Microsoft Visual C++ version 2.00 isinstalled, the default postmortem debugger is changed to the Visual C++interface.
In order to change the default debugger for unhandled user mode exceptions,do the following:
WARNING: Using Registry Editor incorrectly can cause serious, system-wide problems that may require you to reinstall Windows NT to correct them. Microsoft cannot guarantee that any problems resulting from the use of Registry Editor can be solved. Use this tool at your own risk.
Start Registry Editor and locate the following Registry subkey in the HKEY_LOCAL_MACHINE subtree: