security essentials much slower on XP than on Vista

[Guest tanglewood03]

I have MSE installed in my XP desktop and on my Vista laptop. When I turn on task manager in XP, a snapshot view shows MsMpEng at the top of the list for mem usage (49,000K), VM size ((90,000) I/O read bytes (1,400,000,000) I/O write bytes (256,000,000). If I start from boot without accessing the Internet, I/O read bytes and I/O write bytes keep increasing. I am not doing a scan. Program msseces is also running but not impacting performance. MpCmdRun also shows up occasionally. Windows Defender is not installed.

When I turn on task manager in Vista, program msseces is the only one running and not impacting performance. Windows Defender is turned off.

I saw on another web site that MsMpEng is part of Windows Defender. Is this correct?

 

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