ZA isn't bad, I used a trial and it has great protection. Its for those who are very wary, because it will notify you of any dataflow unless you tell it not to. It does provide good coverage though.
I swear by my little triforce-Spybot S&D
- a good program, doesn't always
find everything affecting the computer. Pretty fast search as long as you don't have too many files. Its a quick fix for an antispyware.Adaware SE
- another fine program. I haven't delved to deep into its settings, but I know that it sometimes finds infections that Spybot does not (whether or not Spybot is updated to the max or not, I'm not positive) but when I run Adaware and find more junk, then I know I've rid my computer of harm.AVG
- Ahhhh this is a dream antivirus. Thank god for it. I don't want Norton, I don't want Mcafee, nothing. Those cause problems everywhere. I understand they block really well, good protection, but A: they cost money, and B: They can break things. AVG has made (im sure) many users content with its free protection services.
As for popup blockers, I have only used free blockers I've downloaded by searching on Google, and MS Popupblocker. The Microsoft Blocker is good, but seems to cause errors quite a bit as well. I'm not sure if it costs or not. I don't really use a popup blocker, since I access some sites with required popups.
Its up to preference really. These are just suggestions that work for me