CTRL + SHIFT + C Shortcut

I'm playing The Sims 4 on a rather old Compaq Presario computer with Windows 7. The game runs great! Absolutely everything works, including other shortcuts, besides CTRL + SHIFT + C. Instead, pressing the keys uses a shortcut on my desktop to click and drag programs. I've tried repairing the game, restarting the computer, reinstalling the game, even disabling all keyboard shortcuts on the computer. This shortcut just doesn't go away. It's not that I NEED to cheat, just having the option available is nice... Especially when you're trying to do a challenge and you're preparing stuff to do said challenge with. It's frustrating trying to do specific things without cheats. Is there any way at all to fix this or am I stuck?