Forcing progs to use both CPUs of a dual-core system?

Hi, all -

I have two programs, a video editing studio and a game simulation, and both get real sluggish when they start using max CPU according to Task Manager.

The thing is, they're both only using one side of the dual-core (E5800) chip.  The obvious 'trick' would be to run an app that forces programs to use both parts of the dual core.  Does anyone know if such an animal exists?

Thanks,

Joe