MsMpEng.exe constantly run when my computer is idle

[Mextron]

Why does MsMpEng.exe constantly run when my computer is idle even though I have disabled scheduled scanning?

Windows 7 32bit Professional SP1
Security Essentials Version: 2.1.1116.0
Antimalware Client Version: 3.0.8402.0
Engine Version: 1.1.7903.0
Antivirus definition: 1.117.2469.0
Antispyware definition: 1.117.2469.0
Network Inspection System Engine Version: 2.0.7707.0
Network Inspection System Definition Version: 10.7.0.0

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