Microsoft Corp. will stop providing free support for the Windows 7 operating system Tuesday, and warned an estimated 13.9 million computers in Japan still using the system could become more vulnerable to virus infection or hacking of personal data.With the end of support, users need to upgrade to Windows 10 or other operating systems. They should also consider buying new computers as older machines may not be compatible with the newer software, the Japan unit of Microsoft said.Microsoft has provided free updates for Windows 7 users to fix security bugs regularly, around once a month, but th…READ FULL ARTICLE