some problem in star-cd

kathir

hi i am new in satr cd i have done one tutorial in prostar. that is IC engine combustion and simulation using moving grid method. first i am import the geometry and then i am start to type even program coding in Input/output windw. at the middle of the tutorials i am save and close taht file next day i cant open the prostar, stardesign anythink. system says "please check the setup". but i saw now system backgroung one visual basic program file is running. after that i am delete all the star cd files corresponding to that tutorial after that it working. so please tell why thi problem occurs.