As of , Microsoft officially discontinued new downloads of Microsoft Security Essentials. While definition updates for existing installations are still occasionally available via the Microsoft Security Intelligence portal, finding a legitimate offline installer for the software itself is difficult because official direct links have been removed. 1. How to Secure Windows 7 64-bit Today
Because Microsoft no longer supports Windows 7, using its legacy security tools is risky. For a 64-bit system, your best options for "offline" or manual protection are: download windows defender windows 7 64-bit offline installer
Windows 7 does not have a "Windows Defender" antivirus download because, in Windows 7, the original Windows Defender was only a basic tool. For full protection against viruses and malware, Microsoft released Microsoft Security Essentials (MSE) . As of , Microsoft officially discontinued new downloads