Performance Profiling: IIS crashes

I'm profiling an ASP.NET app for performance on a W2003 Server, IIS 6. I have tried setting the web site to run in IIS 5 isolation mode.

The profiling stops when IIS stops responding.

The following events are loged when the crash occurs:

Event Type: Error
Event Source: .NET Runtime
Event Category: None
Event ID: 1023
Date: 7/27/2006
Time: 10:28:27 AM
Description:
.NET Runtime version 2.0.50727.42 - Fatal Execution Engine Error (7A05E2B3) (80131506)

For more information, see Help and Support Center at http://go.microsoft.com/fwlink/events.asp.



Event Type: Error
Event Source: .NET Runtime
Event Category: None
Event ID: 0
Date: 7/27/2006
Time: 10:28:27 AM
Description:
The description for Event ID ( 0 ) in Source ( .NET Runtime ) cannot be found. The local computer may not have the necessary registry information or message DLL files to display messages from a remote computer. You may be able to use the /AUXSOURCE= flag to retrieve this description; see Help and Support for details. The following information is part of the event: .NET Runtime version : 2.0.50727.42 - Application ErrorApplication has generated an exception that could not be handled.

Process ID=0xe64 (3684), Thread ID=0xdc (220).



And this event is loged when the browser window is closed after the crash:

Event Type: Error
Event Source: ANTS Profiler
Event Category: None
Event ID: 0
Date: 7/27/2006
Time: 10:28:36 AM
Description:
System.ArgumentException: Process with an Id of 3684 is not running.
at System.Diagnostics.Process.GetProcessById(Int32 processId, String machineName)
at System.Diagnostics.Process.GetProcessById(Int32 processId)
at RedGate.Profiler.Engine.ProfileIISController.StopProfilingIIS()

For more information, see Help and Support Center at http://go.microsoft.com/fwlink/events.asp.



Any ideas will be greatly appreciated.
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