I've installed a lot of new software, unfortunately. I'd like to start purging the system and simplify again. Like you said, though, stuff always "lingers." I'll clean my registry ASAP -- thanks.
I have 58 services running, and as I am playing music now, my CPU usage is hovering around 25%. Deactivating Dolby Headphone reduces CPU use by an average of 4%. This laptop doesn't have a dedicated sound and video card like my desktop does, so I'll admit I may have come to expect higher performance, but it definitely shouldn't struggle to play music and farmville at the same time.