This is a multipart question but it all deals with the same topic. I will raise and split points if I need to. In my new apartment, my roommate has a DSL connection (we're using SBC/Yahoo DSL, if you were wondering). She has a LINKSYS wireless router for her laptop, and her eMachines PC is the one hooked up directly to the DSL modem. I have a Dell PC (2 Ghz, P4, enough space for whatever). I currently use Norton A/V, but my edition doesn't come with a firewall.
What sort of network adapter card and/or router do I need to get my PC hooked up to the existing DSL line? What sort of pricing is considered decent? Can I just buy an adapter and get wireless service through her laptop router? I'd like to go wireless instead of running a 30' cable through the apartment. Also, what firewall software do you recommend I get, or should the firewall software be only installed on the machine that the DSL modem is hooked up to?