When I start unity it starts normaly but when i try to do something it makes the computer freeze (I can zoome and create "new scene" but nothing else). I have to hold the start button and force the computer to shut down. It happens every time I start unity.
Do I need a special update or dosen't it work on windows vista?
The computer can't be to slow.
"The computer can't be too slow." People often have skewed perspectives on hardware. Why don't you post what you have, and then someone here can tell you if you have a good enough machine or not.
As far as Unity crashing... I would file a bug report. Support questions like this usually aren't answered here, you're much better off letting the good people at Unity know about your problem.
And, in my opinion, you shouldn't be using Vista. Most of the Unity crashes I read about here are on Vista (especially the x64 version, for some reason).
I have the same problem with games i personally don’t know what happens and my computer is normally fast and i also don’t know how to update the unity.