you didn't mention in the original post that you were using dvd shrink. are you using anydvd with it? what version of anydvd are you using?

is there an error essage when it stops at 50%? what happens?

if you're using shrink alone there are some copy protections that it can't handle. anydvd should be able to take care of it unless it's some brand new protection that we haven't come across yet. In order to determine what the issue is though I need the info I asked for. We can't help if you don't tell us anything. What happens when it stops would be especially helpful. Does your comp freeze, does it reboot itself, do you get an error message, does your computer throw itself out a window?