I need to have a form load whenever a new serial port is added to the system.  

I've created an EventWatcher to perform this and the event is triggered as
expected.  However, the form that is loaded from within the event is frozen.  
The mouse is in the hourglass, the form cannot be clicked, moved, closed,
activated, and does not properly display itself.  I've checked to see if it
is a problem with the form, however even if the form has no controls/code
other than the windows required code, it still behaves in this fashion.  

Can anyone give me some insight as to why this is happening, or a possible
alternative method.  

Code snippet:

   Private Class PortMonitor
       Private w As ManagementEventWatcher = Nothing

       Public Sub Start()
           Dim q As WqlEventQuery = New WqlEventQuery
           q.EventClassName = "__InstanceCreationEvent"
           q.WithinInterval = New TimeSpan(0, 0, 3)
           q.Condition = "TargetInstance ISA 'Win32_SerialPort'"
           w = New ManagementEventWatcher(q)
           AddHandler w.EventArrived, New
EventArrivedEventHandler(AddressOf Me.OnPortArrived)
           w.Start()
       End Sub

       Public Sub [Stop]()
           RemoveHandler w.EventArrived, New
EventArrivedEventHandler(AddressOf Me.OnPortArrived)
           w.Stop()
           w.Dispose()
       End Sub

       Protected Sub OnPortArrived(ByVal sender As Object, ByVal e As
EventArrivedEventArgs)
           Dim f As New Form1  
           f.Show()   ' Form is locked up!
       End Sub
   End Class

Thanks