Solidworks 2008 or 2009 confilct with autocad mechanical 2009 ????

Hi,I just installed autocad mechanical 2009 ,then I foundsome problem my Solidworks 2008 .Everytime when I click GeneralSettings in the Flow simulation analyze tree or in the wizard step3(select Unit) ,the Solidworks 2008 crashs, SW 2009 is the same.
Everything goes fine with SW before I installed the AutocadMechanical 2009.
Help me ,thanks.SolidworksFlow Simulation