Turn on the Default Microsoft Games in Windows 7

http://answers.microsoft.com/en-us/windows/forum/windows_other-gaming/does-windows-7-professional-contain-microsoft/1cd0ceca-6320-45b4-aa62-b26ae591bd86

Windows 7 Professional includes the default Microsoft games. They’re disabled by default.
Follow the below steps to enable the games:
1.  Click the Start button, click Control Panel, click Programs, and then under Programs and Features, click Turn Windows features on or off.
2.  Select the Games check box, and then click OK.

=========How to just modify startup programs===============
1. Start "Run..." Program
2. Type in "msconfig" in the "Run..." program.
3. Go to Startup tab there you can change your startup programs.
4. Also make sure all of the programs under the Services tab are checked, because if they are not your computer will not start up properly.