For some stupid reason my friend has a trojan warning when he wants to download the game. He legally bought it on Steam so I don't know what could be a problem

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I see the loading screen for a bit but then the game just shirnks to the top left corner and doesnt work at all i tried running the compatibility troubleshooter didnt work aswell please help

Whenever I try to open up the game it briefly shows a loading screen, followed by a black screen and then disapears. Sometimes I also hear the pixar lamp hopping sound, but nothing else. Does anybody know how to solve this?

I loved this game when i was a kid, now I'd like to play it again, but I'm unsure if I can play it.