System is Windows 2008 Standard. Every time I go to open the Exchange Management Console I get an error "MMC has detected an error in the snap-in and will unload it. I click "Ok" and get this: System.Reflection.TargetInvocationException at System.RuntimeTypeHandle.CreateInstance(RuntimeType type, Boolean publicOnly, Boolean noCheck, Boolean& canBeCached, RuntimeMethodHandle& ctor, Boolean& bNeedSecurityCheck) at System.RuntimeType.CreateInstanceSlow(Boolean publicOnly, Boolean fillCache) at System.RuntimeType.CreateInstanceImpl(Boolean publicOnly, Boolean skipVisibilityChecks, Boolean fillCache) at System.Activator.CreateInstance(Type type, Boolean nonPublic) at Microsoft.ManagementConsole.FormView.InternalInitialize() at Microsoft.ManagementConsole.View.HandleInitializationRequest(IRequestStatus requestStatus) at Microsoft.ManagementConsole.View.ProcessRequest(Request request) at Microsoft.ManagementConsole.ViewMessageClient.ProcessRequest(Request request) at Microsoft.ManagementConsole.Internal.IMessageClient.ProcessRequest(Request request) at Microsoft.ManagementConsole.Executive.RequestStatus.BeginRequest(IMessageClient messageClient, RequestInfo requestInfo) at Microsoft.ManagementConsole.Executive.SnapInRequestOperation.ProcessRequest() at Microsoft.ManagementConsole.Executive.Operation. I have since reloaded the SP3 and rollup 5. Reinstalled .net 3.5 sp1. Any help would be greatly appreciated.

Checked the following location: C:\Documents And Settings\scom\Application Data\Microsoft\MMC Renamed the existing adminconsole file to adminconsole.old Opened the console again.Terence Yu TechNet Community Support

No such file exist. I did replace the "Exchange Management Console.msc" file with a new one from a SP3 download, but get the same error. Thanks for the response.