What are people using for various security utilities in vista so far am struggling to find a firewall and antispyware software for vista but on the other hand antivirus i find is great comming from Nod 32 very highly rated, what security app are people using that are also on vista?

My brother sometimes uses my pc for games but he doesn't have admin rights. It's pretty easy to tell if you're infected with something, popups, high cpu usage etc so i'm confident that i'm fine 