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Microsoft Security Essentials provides real-time protection for your home or small business PC ... A new Surface Pro 7 displaying mountains. Download Microsoft Security Essentials (64-bit) for Windows PC from FileHorse. ... Windows Vista64 / Windows 7 64 / Windows 8 64. How to download and install a Microsoft Security Essentials update: Check whether your version of Windows is 32-bit or 64-bit. In the table left, click on the link ... Most Windows versions subsequent to Windows 7 will have spyware protection already installed (known as Windows Defender).