Markerserver module error

 I am using Pspice 9.1 Std. ver. on vista. When I want to put a probe on my circuit design programme closes. At first it give an error named "Markerserver module has stopped working" and after that when I try to put a probe it always closes. I do not know it is the problem but in short I can't do any simulation. Plz Hlp!

 Best Regards

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