If you are using Windows XP, the voice of Microsoft Sam (US male) has been installed by default. On Windows Vista and Windows 7, Microsoft Anna (US female) is the default and only English voice. On Windows 8/8.1, there are three voices available: Microsoft David (US male), Zira (US female), and Hazel (UK female), you can also add more voices by installing the corresponding language packs. On the latest Windows 10, you will get dozens of text to speech voices by installing the language packs.
Users can also install third party voices that are Microsoft SAPI 5 compliant, you can find voices in various languages in the following websites: