Hi Owl :
There are a lot of better programs than the "Windows Defender" and
the "Windows Firewall" ; one of the Best antiSPYWARE/antiTROJAN
programs is the FREE version of SUPERAntiSpyware from
www.superantispyware.com . If possible, another Good, and after 30
days FREE, antiSPYWARE program would be AVG Antispyware, most
easily downloaded from www.ewido.net ; however, I am NOT sure if
AVG AS is Vista compatible !?
At present, your Choices for replacing the sub-standard "Windows
Firewall", are limited. The most reliable site I know is :
http://windowsconnected.com/blogs/corrine/archive/2007/03/28/vista-compatible-firewalls.aspx .