SQL Express Manager: Error occurred during application start up sequence

TITLE: SQL Express Manager
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Error occurred during application start up sequence. Application will be shut down.

For help, click: http://go.microsoft.com/fwlink ProdName=Microsoft+SQL+Server&ProdVer=9.00.1187.00&EvtSrc=Microsoft.SqlServer.ExpressManager.SRMainError&EvtID=ErrorDuringApplicationStartup&LinkId=20476

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ADDITIONAL INFORMATION:

Method not found: 'Void System.Windows.Forms.MenuStrip.set_Raft(System.Windows.Forms.RaftingSides)'. (XMApp)

Program Location:

   at Microsoft.SqlServer.ExpressManager.XmApplicationModule.CreateMainMenu()
   at Microsoft.SqlServer.ExpressManager.XmApplicationModule.Load(IServiceContainer serviceContainer)
   at Microsoft.SqlServer.ExpressManager.Application.Run(IApplicationModule applicationModule, String[] args)

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BUTTONS:

OK
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