vmplayer and cs50 appliance not opening

[Sarmistha Sahu]

while running a program, the program did not stop. Hence i used CNTR-ALT-DEL and forced shut with the task manager. Now when I try toopen the cs50 appliance it says " busy working". I am not able to stop or do anything else. Kindly help. Some  half a  page of error message is on the terminal .....Not able to remember what it is .......cache etcis written.