The community is also a great place to check out. Try these places for help from other users:
If you're encountering issues with launching Cannon Fdder 3, make sure everything installed smoothly.
Exit Steam entirely.
Browse to your Cannon Fdder 3 installation folder (Usually C:\Program Files\Steam\steamapps\common\Cannon Fodder 3\)
Run the following installers:
Reboot your computer and test any issues again.
If the above does not resolve the issue and you are running Windows 7 or Windows Vista, please complete the instructions in our Windows 7 and Vista Troubleshooting FAQ.
If you are running in Windows XP, take the following steps: