Windows Defender/Malicious Software Removal Tool/Antimalware/Security Essentials: What are the differences?

[Bob Is Interested]

And why can't Microsoft get its act together regarding antivirus detection? Every year its some new tool with a different name. Yet they all seem to do the same thing: Look for virus problems. I'm using Win7.I have Windows Defender in Control Panel (it doesn't launch).I have the Malicious Software Removal Tool and that works. But it never finds anything. I have Security Essentials which works. Probably has never found anything. So do these 3 things do the same tasks in Windows 7?

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