[Arkcon]

This comes up once and a while, some suggestions:

Reboot, and see if the problem is still there. Sometimes, if you've run Window's Media Player once before you run SE4, video is slow in SE4.

See if CD music is the cause. Maybe you could play CD music on with your old system, but a slowdown on your new, better, system could be due to a diferent hardware interface. If CD music is on, be sure a data only CD (for example, anither game) isn't in the drive. That really slowed down SE4 when I upgraded to WinXP

Tweek some random video settings or SE4 settings. Beats just living with the problem.