Wild Tangent I know is used with Cox Cable Network to stream Video, But I also Believe It's used as a carrier for other Less Respectfull sites, IE. Gambling, Porn, Dial Up to Some wierd 34rth world Country that like to steal your Information.
As for setting the PC to Highsecurity, Let me give you a Breakdown of what I use, Of course Spyware, TeaTime, And Adaware, but also Zone Alarms Pro, And HiJack this.
I've not had any Problems at all, Also Jack, I strongly suggest you use FireFox as your Browser, alot of us have switched to It in order to Get away from IE, and the Security Problems It has.
Stephen