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I've installed Microsoft Security Essentials and my Windows XP Professional SP3 and it does not seem to install update signatures multiple times a day as I'm used to from other virus scanning tools. The signatures were two days old when I updated it manually.
My user account is a limited one, running surun if that might matter. But if I double click the MSSE tray icon and click the Update button myself, it updates, so I guess it can't be a permission problem.
Do they get installed automatically though? I keep seeing definitions released daily but not checked for "install automatically"; they're always under "optional updates". Is there a way to force them to always download automatically? – nhinkle – 2010-09-07T19:12:28.517
Mine come in with normal Windows updates. I also have Microsoft Update enabled so the updates for MSE are installed regularly with other stuff for Windows – codinguser – 2010-09-09T23:23:51.760