SimulationXpress failure errors

Solidworks 2009 Professional
Vista 64

I used the SimulationXpress one one part like a few times, and nowit just fails everytime I try to use it. It said "failed to mesh"and on the left in the red box it sais "failed faces 0 and failededges 0" or something like that.
Is SimulationXpress just broken?
It tells me surface mesh successful but volume mesh failed and toreduce element size (which I did all the way down). Help!SolidworksSimulation