Go to Accessories, System Tools, Disk Cleanup
Calculating Disk Cleanup may take a minute depending on the last time you did it.
Once the Disk Cleanup window appears, click the "More Options" tab on top.
Click the "Clean Up" button under the section entitled "Windows Components."
Double click on "Accessories and Utilities."
Double click on "Games."
Click the box next to each game you want on your computer.
Click OK until you're back to the "Windows Components" page.
The games should be back on the computer.