I'm fairly certain that it isn't a video card problem, as my CPU is bearing most of the load when LimeWire is running like this (hence, the Task Manager saying that I'm using 99% of CPU resources during running Limewire)

Edit: At any rate, I tried setting my video card to "optimal" performace, and that didn't work. Then I tried setting it to the defaults, and that didn't work. I still haven't tried rolling back the driver, but frankly I don't want to do that.