The Windows Defender
Microsoft
Windows Defender scans the files on your computer looking for spy
ware and other malicious programs. Defender can be scheduled to run once
a day, or real time: 24/7. The program will alert you if any bad code is
identified and take action to quarantine the mal-ware.
New spies and
pests are invented all of the time. Windows Defender is set up to
automatically check for updates each day, too.