Hi Raelynn,
I am Dave, I will help you with this.
That software most likely got installed when you were installing other software, some installers have other 3rd party apps they install, it is how they make money, it is best to go through the installer slowly to ensure there is no check box to install other software.
Are you able to uninstall Mobigames from the list in Programs and Features?
If not, the best option is to use the widely available free Revo Uninstaller to remove that from your PC, it is very good at removing even the most stubborn software that Windows cannot uninstall.