Need a bit more details here, what exactly is going on when you touch the screen? Is it a touch screen laptop? Or do you mean when you move the lid the system freezes? Post some more details about the system, what you do that causes issues and if anything happened before the issue started. People tend to leave out details like "oh yea I dropped my laptop, could that have caused the issue?" and it takes 3-4 posts to get all the details out.