The reason behind games installed pre upgrade are not working is likely related to the compatibility of the games with Windows 10. In such scenario you need to install the "Get Windows 10" app. After installation please perform the below steps: 1. In the menu button click on Check your PC to get the details of the games not compatible with Windows 10. 2. After you identify the list of games not compatible with windows 10, try to download the upgraded versions from Windows store.In case it's not available try to uninstall the games using control panel option and install the same again from Windows store.