On a game's detail page, we list the system requirements needed to play that game.
If you're not sure if your computer meets the system requirements for the game, use the free session and give it a try! (that's why we provide those free sessions - just for that reason)
If a game won't launch, check the System Requirements. (see example below) Is this game only for Windows 7, but you're using Windows 10? Then the game might not work for you. Maybe the game requires GHz processor higher than your computer has?
What do you do if your computer can't play the game? At least you used the free session, and now you can go look for another new favorite game!
But, if your computer should meet all the requirements, and you still have troubles playing a game; don't hesitate to send Customer Support an email by clicking "submit a request" and filling out the Tech Help form!