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Simple! You just got the order wrong--it's Shift + Ctrl + C.
What do you mean, Chat Window? Do you mean a chat client (a program that lets you connect to a chatroom)? If so, press Ctrl + Shift + C when out of game to see what opens. Then close it and find the .exe file for it, right click, choose Properties, then change the "Shortcut" to something else.
Have you tried playing without Origin? It's not required to play Sims even if you download the game with it.
Try opening Origin, going to Origin at the top left, Application Settings, in the window that opens go to In Game. What is the Origin In Game Hot-Key set as? Mine is Ctrl+F1. If that doesn't work disable origin in game.