MS .NET Framework jit debugging error

I have been trying to instal ACAD 2008 on a single PC and get the following Microsoft .NET Framework security error. I have updated to the latest .NET Framework software.
I also got the same error when trying to instal an old ACAD 2005 version (as a check).
I have tried changing the acad.exe.config file as mentioned below and have tried installing with the virus software turned off. The machine config file is set to default. This has never occurred with any other software instals.
I have found this error mentioned elsewhere (after a Google search) but have not seen a solution as yet.
regards
PeterH
See the end of this message for details on invoking
just-in-time (JIT) debugging instead of this dialog box.
************** Exception Text **************
System.Security.SecurityException: Requested registry access is not allowed.
at System.ThrowHelper.ThrowSecurityException(ExceptionResource resource)
at Microsoft.Win32.RegistryKey.OpenSubKey(String name, Boolean writable)
at Autodesk.AutoCAD.CustomMigrator.Migrator.SetHasMigrated(String RootRegKey, Int32 iValue)
at Autodesk.AutoCAD.ADMigrator.MainForm.MainForm_Closed(Object sender, EventArgs e)
at System.Windows.Forms.Form.OnClosed(EventArgs e)
at System.Windows.Forms.Form.WmClose(Message& m)
at System.Windows.Forms.Form.WndProc(Message& m)
at System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m)
at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)
at System.Windows.Forms.NativeWindow.Callback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)
The Zone of the assembly that failed was:
MyComputer
************** Loaded Assemblies **************
mscorlib
Assembly Version: 2.0.0.0
Win32 Version: 2.0.50727.42 (RTM.050727-4200)
CodeBase: file:///C:/WINDOWS/Microsoft.NET/Framework/v2.0.50727/mscorlib.dll
----------------------------------------
ADMigrator
Assembly Version: 17.1.0.0
Win32 Version: 17.1.51.0
CodeBase: file:///C:/Program%20Files/AutoCAD%202008/admigrator.exe
----------------------------------------
System.Windows.Forms
Assembly Version: 2.0.0.0
Win32 Version: 2.0.50727.42 (RTM.050727-4200)
CodeBase: file:///C:/WINDOWS/assembly/GAC_MSIL/System.Windows.Forms/2.0.0.0__b77a5c561934e089/System.Windows.Forms.dll
----------------------------------------
System
Assembly Version: 2.0.0.0
Win32 Version: 2.0.50727.42 (RTM.050727-4200)
CodeBase: file:///C:/WINDOWS/assembly/GAC_MSIL/System/2.0.0.0__b77a5c561934e089/System.dll
----------------------------------------
System.Drawing
Assembly Version: 2.0.0.0
Win32 Version: 2.0.50727.42 (RTM.050727-4200)
CodeBase: file:///C:/WINDOWS/assembly/GAC_MSIL/System.Drawing/2.0.0.0__b03f5f7f11d50a3a/System.Drawing.dll
----------------------------------------
AdMigLib
Assembly Version: 17.1.0.0
Win32 Version: 17.1.51.0
CodeBase: file:///C:/Program%20Files/AutoCAD%202008/AdMigLib.DLL
----------------------------------------
System.Xml
Assembly Version: 2.0.0.0
Win32 Version: 2.0.50727.42 (RTM.050727-4200)
CodeBase: file:///C:/WINDOWS/assembly/GAC_MSIL/System.Xml/2.0.0.0__b77a5c561934e089/System.Xml.dll
----------------------------------------
AcCui
Assembly Version: 17.1.0.0
Win32 Version: 17.1.51.0
CodeBase: file:///C:/Program%20Files/AutoCAD%202008/AcCui.DLL
----------------------------------------
AcMNUParser
Assembly Version: 17.1.0.0
Win32 Version: 17.1.51.0
CodeBase: file:///C:/Program%20Files/AutoCAD%202008/AcMNUParser.DLL
----------------------------------------
msvcm80
Assembly Version: 8.0.50608.0
Win32 Version: 8.00.50727.42
CodeBase: file:///C:/WINDOWS/WinSxS/x86_Microsoft.VC80.CRT_1fc8b3b9a1e18e3b_8.0.50727.42_x-ww_0de06acd/msvcm80.dll
----------------------------------------
ADMigrator.resources
Assembly Version: 17.1.0.0
Win32 Version: 17.1.51.0
CodeBase: file:///C:/Program%20Files/AutoCAD%202008/en-US/ADMigrator.resources.DLL
----------------------------------------
************** JIT Debugging **************
To enable just-in-time (JIT) debugging, the .config file for this
application or computer (machine.config) must have the
jitDebugging value set in the system.windows.forms section.
The application must also be compiled with debugging
enabled.
For example:
<configuration>
<system.windows.forms jitDebugging="true" />
</configuration>
When JIT debugging is enabled, any unhandled exception
will be sent to the JIT debugger registered on the computer
rather than be handled by this dialog box.
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