There are a couple of free Anti-Virus programs that are reputable, the one that comes to mind being AVG. However, it seems that a lot of software that was once free/open-source is moving toward the "software as a service" model where you pay a subscription and have to download every new version, rather than for a boxed copy that just updates its definitions.
Others may have their opinions, but the built-in Windows firewall is probably sufficient, especially if your ISP provides a firewall at your Cable/DSL/Whatever modem/router. Don't know if ZoneAlarm still has a free version or not.
OpenOffice is also an excellent alternative to MS Office, if you don't have or want to fork down the cash for a copy.
The bloatware that comes with many new computers can be rather headache-inducing. That's why I stay away from large companies like Dell, who are the worst. When I get a new computer, I make sure that I have an actual install disc for the operating system of choice, and start fresh. The "recovery" discs are coaster ware.
