Vista’s Firewall is very good!

http://www.avast.com/eng/download-avast-home.html

Above is a link to Avast Free 4 Home Anti-Virus
It is low resource using, free and Vista 32bit and 64bit compatible.
Only have one (1) anti-virus installed; more than 1 can cause conflicts.

http://www.safer-networking.org/en/index.html

For Spyware removal, use the above link to “Spybot Search & Destroy 1.5.2”
Download it, install it, update it, immunize your system and scan your
System with it.

http://www.javacoolsoftware.com/

For a non-scanning, but running in the background, Program to STOP Spyware
being downloaded to your Computer, use SpywareBlaster 4, available at the
above link.

IMPORTANT ADVICE:   After scanning with the above Programs, problems still
remain.

Reboot computer, and tap F8 at power on/ startup. From the list of options
that appears, select Safe mode by using the UP and DOWN Arrows, then hit
ENTER.

Rescan the computer in Safe mode.