Get a hardware firewall if you can -- a basic router (which acts like a hardware firewall) from London Drugs will cost you around $50. If you shop around (Memory Express, etc), you can probably get it cheaper... If you want a stand-alone software firewall, you can't go wrong with ZoneAlarm.
For virus scanners, I would recommend PC-cillin from Trend Micro, it seems to catch more than Norton (from my experience)...I used to have Norton Anti-Virus at home (with the latest virus definitions) and decided to try the "HouseCall" scanner from Trend Micro (it scans your machine without having to install anything), and there were some trojans on my machine which Norton never caught. I switched to PC-cillin after that...
For spyware, as mentioned by others, AdAware and Spybot are the standard ones (get both, because they each catch different things)
Hope that helps...
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