LabVIEW probleme nach dem Lauf des Programms

Hallo an alle ,
da ich besser auf Englisch beschreiben kann ,hoffe ich, mache ich das einfach .
I am using LabVIEW 6 , to control a (AT-MIO-16XE-50 ) card from National Instument , I am using LabVIEW to control a data aquisition process , to output some voltages and to measure some voltages as Input
the program goes well with good results but it still one problem , after using my program , I tried to make a resourse test , and it tell me that it hasen't succeed in this test ?
this is not really the problem , the problem that it happens some time after restarting the PC and start my program again , the program will not working probably and I cann't close the LabVIEW(it is just stuck) and then i need to restart the PC and after many times , the program go to work again.
I know this is make no sense , but any suggestion would be so valuable for me since I am just beginner in LabVIEW