Mr Tripper. Very good point regarding protecting your machine once you're on broadband. You will immediately become a soft target. Unprotected the integrity of your system will last approximately 5 minutes, once you connect.
You must have anti virus, anti spam and a firewall. All such may be downloaded for free off the 'net.
Also read very carefully the fine print on the ISP offers. Particularly traffic and download limits and excess fees.
Don't be put off by any of this, the minor hassles are well worth it.