The best program that I know of is called ZoneAlarm. It's easy to install, you just have to answer few questions during installation, and anytime something tries to access your computer it alerts you and gives you the option of allowing or disallowing. I've used it for years and it's never failed me yet!

Go to http://www.zonealarm.com and look for Zone Alarm antispyware

Good luck!

Hugsss
sabby