ok so your setting up a computer for your dad do you want to go with a linux based workstation just to do internet mp3's e-mail etc...even still id just do a windows box and depending on how your network is setup ie if you already have a cable router inplace then there would be almost no real need for a software firewall solution, in my oppinion because your already behind a nat if hes connecting straight to the internet ether via dial-up, or through a cablemodem then your going to ened a firewall solution hell if only the one that is built into xp works ok you know and if your not too familer with linux you may want to setup a windows box, the downside with doing computer work for family members is you are tech support