All WBS computers that have been set up in the last few months have had Microsoft Windows Defender installed (formerly known as Microsoft Antispyware). You should see the circular 'target' icon in the notification area (near the clock)
This software attempts to prevent your computer being infected with spyware in the similar way to that in which antivirus software attempts to protect your computer from viruses.
Microsoft have produced a guide on how to use their Windows Defender software. Unfortunately this material cannot be reproduced here for copyright reasons but is available from their website