Let me tell my problem:

i was using adobe premiere cs3 and I wanted to turn no cs4, so I purschated it, but when I play the videos, i works for some seconds and then it flicks, stop, etc. So I checked my cpu usage and it was work up to 100%. That didnīt happened with cs3. Is there some configuration problem with my pc? Because with cs3 just use 65% of cpu capacity.
Mi cpu is: Amd 64 Athlon 3000+, 2gb and Iīm working with dvcam (16:9).

Thank you for reading and helping!