Camtasia 8; Cant render videos.

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Camtasia 8 (Test version) hangs when i want to render a video. The video is 5 hours long and every time the rendering reaches 100% it just stops and nothing happens. I've let my Laptop on overnight and it still didn't finish. I've tried it with different rendering options (480p and 720p in Mp4; as an avi. etc.) It would really be a shame if i couldn't render he video, because its a family video and i promised them it would work. I have Win7 64bit version and camtasia 8.0.1(Test version).
Yes, i know people already had this issue and ive read the posts before writing this, but noone of them had camasia 8, so ive decided to ask a new question.