I've been using MSE on my main PC, after extensive testing on my laptops. It offers excellent protection, when it does run a scheuled scan, it doesn't seem to slow down my system. It doesn't have all of the controls that Avast! does, but it does it's job well and silently. I recommend it to anyone who just wants to download, install & go, it does just that. There are a couple of advanced features to select, a basic or advanced membership for reporting issues (spyware, adware, viruses, etc). I do a through scan every other day and a scheuled (short) scan every night at 1am, when I'm usually on here. That way, you can tell if it's slowing your system. Microsoft has outdid themselves this year, releasing MSE & Windows 7 close to the same time. Now if they would go to work on IE........
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