What is difference between Microsoft Security Essentials and Windows Defender?

Windows Defender helps protect your computer from spyware and some other potentially unwanted software, but it will not protect against viruses. In other words, Windows Defender only protects against a subset of known malicious software but Microsoft Security Essentials protects against ALL known malicious software.

Windows Defender helps protect your computer from spyware and some other potentially unwanted software, but it will not protect against viruses. In other words, Windows Defender only protects against a subset of known malicious software but Microsoft Security Essentials protects against ALL known malicious software.

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