NV Access, the makers of the popular NVDA screen reader, will no longer be able to support older versions of Windows, such as Windows XP and Windows Vista. The change will take place with the release of NVDA 2017.4, which should be released at the end of November. NV Access will continue to offer NVDA 2017.3 for people who can not update to a newer operating system.
From the Developer
After much consideration, NV Access has decided that NVDA 2017.3 will be the last version of NVDA to support older Operating systems such as Windows XP and Vista. NVDA 2017.4, which will be released around the end of November, will require windows 7 Service Pack 1, or Windows Server 2008 R2 Service Pack 1 to run. Those users on older Operating Systems can continue to run NVDA 2017.3.