Retailers will face an increased risk of data breaches after Microsoft ends support for Windows XP, a version of which powers the majority of modern cash registers, security vendor Symantec warned in a report published Monday.Many point-of-sale (POS) devices run the Windows XP version of Windows Embedded, a scaled-down version of the operating system designed for devices such as set-top boxes and vehicle computers. Microsoft will no longer provide security patches for Windows XP as of April 8, when it ends support for the 13-year-old OS.