Windows Defender features

.. New option to display Windows Defender system tray icon even when there
are no pending actions needed.
.. Enhanced performance through a new scanning engine.
.. Streamlined, simplified user interface and alerts.
.. Improved control over programs on your computer with enhanced Software
Explorer.
.. Multiple language support with globalization and localization features.
.. Protection features for all users, whether or not they have administrator
rights on the computer.
.. Support for assistive technology for individuals who have physical or
cognitive difficulties, impairments, and disabilities.
.. Support for Microsoft Windows XP Professional x64 Edition.
.. Automatic cleaning according to your settings during regularly scheduled
scans.

Microsoft encourages all Windows Defender (Beta 2) users to download and
install Windows Defender.

http://www.microsoft.com/athome/security/spyware/software/about/releasenotes.mspx


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Jorge Moura