Make Sure Microsoft Security Essentials Has Updated Definition Files

First you might open it up and go to the Update tab and nudge the Update button.

Another method is to use Windows Updates.

Open Windows Update from the Start Menu or from theTaskbar if you’ve pinned it there.

If you manually check Windows Updates everyday, more than likely there will always be a new definitions update.

Then run mpam-fe.exe as administrator and you’ll be updated.

ensure Check for the latest virus and spyware definitions before running a scheduled scan is selected.

This will ensure MSE downloads the latest definitions before a scan.

This way you’ll be sure to get the latest definition files everyday.

Just download and install it accepting the defaults.

This will work with MSE V 1.0 but doesn’t work with the new MSE beta 2.0.