If anyone is using anything different please go curl up in a corner and feel ashamed of yourself.
AntiVirus: AVG Free Edition 7.5
Firewall: Windows' built-in firewall is just fine.
Browser: Mozilla Firefox. So secure it makes the AV and FW redundant really...
AntiSpyware: AVG Anti-Spyware
I have never, EVER had any problems on any computer using this setup.