I tried rebooting a couple times--it's the Windows way--but that didn't make a difference.
Looked in the synaptics utility that shows in the systray--thought I saw something there about enabling touchpad/usb mouse simultaneously, and maybe a toggle would fix that. Nothing.
The device manager said everything was running fine. I figured I would probably have to uninstall and re-install drivers, because Windows just breaks, and this is something you have to accept.
Well, after a little search, seeing people had problems installing the driver, or the ALPS driver worked for them, I saw one that said 'try Fn-F7.'
Fn-F7 toggles the touchpad. Problem solved.