We can't really help you with pirated copies, you'll have to look elsewhere.
That said, I can't give you any advice on the subject, but it's probably worth mentioning this for any future troubleshooting posts you may need - we would have needed a bit more information than this because the post as it is doesn't give us much to go on, we can't solve the problem this way for you.
As it is, all we really know is that it doesn't work anymore. If we had more information we could come to a better idea of what might be broken and why it isn't working. It'd be helpful to know any things like: Does it give out any error message, and if so what is it? Does the game crash to desktop, or just remain frozen until you close it? How recently did it stop working (give us your best guess, don't need exacts) - has your computer had any updates or other major changes to the system during that time?
The more we know about the situation, the more likely it is someone may have a solution. Just a suggestion for next time.