UNINSTALL PROBLEMS!!

okkaayy soo i bought the direct download of sims 3 and sims 3 supernatural. downloaded both of them on origin. so once they were done downloading i clicked sims 3 to install...unfortunately...my computer decided to shut down for a update in the middle of installing it... so when i turned my computer back on and went to origin it said play so im like cool..i guess i can play..which i was able to, went to sims 3 launcher and it let me play..unfortunately when i wanted to download sims 3 supernatural..it says i need to download sims 3 first...so i went back to origin to try to unistall sims 3 again..but..i dont have a folder or anything, ot an application to unistall..but origin keeps the thing up as play...i dont know what to do...i really want to download sims 3 supernatural bc i paid alot of money but i dont know what to do...