If you are referring to the Control Panel App in Metro UI, you can do the following steps:
1. type "Control Panel" on the Metro UI start screen
2. right click on the "Control Panel" icon (under Apps)
3. select "Pin" from the right bottom corner.
The Control Panel App should show up again on your UI.
If you are referring to the classic desktop:
1. Right click on desktop
2. Select "Personalization"
3. Click "Change desktop icons"
4. Check the "Control Panel" box and click "OK"
