Two easy way to do this

Download zonealarm (
www.zonelabs.com ) and upgrade to the pro version. I'm not a big fan of software firewalls myself so the other option would be picking up a d-link (or other brand) router. This will handle port/IP masking out of the box (read: little real config required). Keep in mind that most firewall configs DO NOT prevent spyware/trojans etc from infecting the computer, however they will prevent them from allowing access and sending out personal info. Two programs, adaware (
www.lavasoftus.com) and spybot (
www.download.com) are great tools for cleaning up spyware. The above coupled with an AV app will cover most of your bases. I'd be happy to give you more details in a PM or new thread.
As for the screen name??? Who know, who cares? I didn't because as an old school IT guy it's just in my nature. When meeting scubaboard people I use my real name, I sign PM's with it and anyone diving with me can copy my license plate from the car (if they are really curious). I think my attitude is why the heck do you care? Who the heck are you that I should give you my name? I don't flame people and I really do try to live up to the following... If I wouldn't say it to your face, I will NOT type it.