Thanks for letting me know! I've never encountered this problem before, so I assumed it was caused by the game. Looks like I was wrong.
UPDATE: I fixed the DirectX problem and the game works now, so I played it. Now, for an actual review:
First, I really love your art style, it's super cute! Second, there wasn't really that much of a plot (it was a typical yandere story and that's practically it), and Yuki doesn't have much point in the story. Third, there were a lot of grammar errors, so you might want to fix that. Finally, the way the Good End went, with everybody nonchalantly going to class after a murder just almost happened, was a bit... anticlimactic.