Animation pauses in IE when I move the mouse over

Hi, I made a search but could not find anything relative in the forum, sorry if this has been answered before :

While browsing sites in IE7, when I move the mouse over a flash animating item, the animation stops for a second. If I keep moving the mouse left and right very fast over the animation, it doesn’t move at all until I stop moving the mouse.
I tried the same in Mozilla and everything is fine so I guess it is not my computers fault.

Has anyone else experienced the same problem and how do I fix this?

Thanks