Tell him he needs to give you the 400$ back that you used. If you paid 400$ to help him get a computer, you should have equal access. If he doesn't give you equal access, than it's not your computer. Tell him you want the password, or 400$ so you can have your own computer. If he doesn't give you either of those, then you have a serious problem, then he is the controlling person others are saying. Then I suggest get out, and take your baby with you. That will be hard, he may have cut things off. Keep going to work, that may be your best out from all of this.