Some animations not updating while playing sound in Windows Media Player

Originally noted in issue #286

**To reproduce:** On the Windows 98 demo, play a wave sound file, and as it is playing, hover the cursor over the play button.
**Expected:** The tooltips should show up immediately and the sound playback should be uninterrupted.
**Observed:** The sound is interrupted, and only when you move the mouse does the tooltip animation start to update, and the next sound fragment is played.

Other kinds of animation also produce this effect, e.g. opening the start menu, opening menus, and minimising the window.