you might wanna look around first on this site concerning any other problems.
in this case yours is the generic omg it doesn't work halp problem.
first off you might wanna add some pictures of the problem since that's handy for us so we can see what your problem is.
second did you set your system to japanese locale incase you did not around 90% of the vn's wont work.
incase you dont know how to set your system locale to japanese here's some images to help you around.
first off go to control panel