Vista - Cannot view event viewer.

I try to view the Event Viewer and every time I get this error:
------------------------------------------------------
FX: {bo5566ad.....}
Exception has been thrown by the target of an invocation.
Exception type:
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.OnThreadTransfer(SimpleOperationCallback
callback)
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Does anyone know how I can fix this?

Thank you

Nancy