Sound in Flash 7 player

It seems that ever since I installed Flash M X 2004, which also installed Flash 7 player, the sound on quite a lot of animations on the web have become out of synch. Although there are some that are still okay.

Is there a bug with sound in Flash 7 player that causes this?

Is it possible to have internet content viewed in Flash 6 player while I have Flash MX 2004? Because I didn’t have this problem with Flash 6 player.