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Why Antivirus is needed for Windows 7 OS Installed PC Microsoft discontinued its support for Windows 7 long time back. Of course, it still continues to deliver security patches. But does not offer the all-important online and phone support. So, knowing very well the Windows 7 security issues, what are you going to do if your Windows 7 OS runs into a huge security problem? Who are you going to reach out to, now that Microsoft has discontinued its Windows 7 support service?