NVDA
The NVDA screen reader can be downloaded free of charge by anyone. NVDA believes everyone, especially the world’s poorest blind people deserve access to computers and a way out of poverty. 

Please note: NVDA is only available for PCs running Microsoft Windows 7 SP1 and later. If you require a version of NVDA that can still run on Windows XP or Vista, please download the much older NVDA 2017.3 for Windows XP instead. NV Access does not however recommend or support running this older version on newer Operating systems.