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27 Mar 2010  
Microsoft MVP

Vista, Windows7, Mint Mate, Zorin, Windows 8

I assume the process was the MsMpEng.exe - that is MSE alright. I would understand the 50% whilst it was scanning - and it can do that for a looong time if you specified "full scan". But normally MSE should be quasi invisible. mine is at 0% most of the time.

Have a look at the settings whether you can see anything unusual. And do not turn it off, then you have no protection.
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