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(RuntimeTyp e 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.InternalIniti alize()
at
Microsoft.ManagementConsole.View.HandleInitializat ionRequest(IRequestStatus
requestStatus)
at Microsoft.ManagementConsole.View.ProcessRequest(Re quest
request)
at
Microsoft.ManagementConsole.ViewMessageClient.Proc essRequest(Request
request)
at
Microsoft.ManagementConsole.Internal.IMessageClien t.ProcessRequest(Request
request)
at
Microsoft.ManagementConsole.Executive.RequestStatu s.BeginRequest(IMessageClient
messageClient, RequestInfo requestInfo) at
Microsoft.ManagementConsole.Executive.SnapInReques tOperation.ProcessRequest()
at
Microsoft.ManagementConsole.Executive.Operation.On ThreadTransfer(SimpleOperationCallback
callback)
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Does anyone know how I can fix this?

Thank you

Nancy