Se eu aceitar a atualização do Windows 10, todos os meus jogos e programas deixarão de funcionar?
Will my devices and apps work with Windows 10?
Windows 10 is designed to be compatible with the vast majority of Windows 7 and Windows 8.1 devices -- so your device is most likely compatible.
For details on your specific device and apps, you can use the Get Windows 10 app to do a compatibility check. Click the menu in the upper left of the app, and select “Check your PC” or “Your PC is good to go.” This displays any compatibility issues we find and recommends a resolution; while we don’t have info on every app or device in existence, it provides a comprehensive list of all known potential compatibility issues.
Some Windows 10 features will require advanced hardware and not all features and services are available on every device, nor in every market. For instance, Cortana is not available in all markets.
Fonte Windows 10 Q & A