I downloaded the game and it wont let me play the game, what is wrong?

<span> <li> <p>Turn on your playstation 3 console.Scroll right to the Network menu and choose "playstation Store."Using the left joystick to move the cursor, click on "Games."Click on "Game Demos."Click on the left and right arrows until you see a game you would like to download. Click on that game's icon with the cursor.Click "Download." The demo will begin to download. Click "Perform in Background" to continue browsing, or to leave the PlayStation Store.Repeat Steps 5 and 6 if there are other demos you wish to download. You can download more than one thing at once, and you can manage your downloads in "Download Management" in the Network Menu.When a game is finished downloading, you can install it by clicking on the game icon in the Game section of the Main Menu.<br /></li><span><br /><br /><br /></span></span>