Thanks everyone but I got Camtasia! It works great!
I have camtasia and it is not that good...I started using and great! But after some time, I could record but when I would see the video my computer got shut down! And those other ones that you guys say make me lag. Even with OptiFine. If someone know any other one to record please advice me
PS: I don't like pirate ones, and fraps for free just record 30 seconds