@CoffeeBaesh I'm guessing the game's program files didn't just disappear on you all of a sudden. (You can always check by opening Program Files (x86)\Origin Games, right-clicking on the Sims 3 folder, and selecting Properties; the size is probably the same as it ever was.) I don't know why this happens either, although I've read the occasional complaint about it. Of course, if your game is getting deleted in its entirety, that's a more serious problem, but it doesn't sound like this is the case.
In the future, you can always try repairing the game in Origin. (Right-click on the TS3 icon in your game library to see the option.) This doesn't actually change TS3's program files, it just repairs the connection between the game and Origin. And it should take much less time than reinstalling everything.
The next time it happens, it would be great if you could grab a screenshot of the message. And if you happened to remember recently updating Windows or any other apps, especially an antivirus or firewall, that would also be useful information.
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I don't work for EA. I'm just trying to help fellow players with their games.
