Trying to animate but the animation is choppy


I have a big issue concerning Flash 8. When I try to make a simple Motion Tween, the animation is very choppy - not smooth at all. I tried to play with the Frame Rate and the Easing, but it wont go. I would like to make smooth animations for my web designs - and this issue is blocking me to learn Flash. Is it because I have a ****ty computer? Is it something I messed up? Please help me - I would like to solve this issue once and for all.

Thnx in advance,

Regardz, BH