My world has come crashing down when i found 100's of child porn images on my husband's laptop. We have a beautiful family. What should i do?

Pedophilia is a serious psychiatric disorder, and one that should be dealt with as soon as possible. With the details that you've provided, I'd be reluctant to give your husband the benefit of the doubt. (Seriously, what more evidence do you need?) You should talk to him about this, but make sure first of all that you have enough evidence and make sure at least one person in the family knows about this.