@danasledge I'm not sure exactly what's going on with the error message you received, but try restarting your computer. If Origin opens at startup, either disable this option or quit it before clearing the cache. Or uninstall Origin entirely (the hard way again, so you're removing everything).
How much space do you currently have free on your hard drives? On which drive is TS3 installed? Windows itself needs a significant amount of free space in which to maneuver, so even if you do get Supernatural installed, you could run into problems as you accumulate saves and other content.