Okay, there's been a general lack of activity on these forums, so I'll give you guys something to argue about.
The computer at my house is used by multiple family members. The extent of programs on there include Ventrillo, a couple of online games that don't run continuously, Firefox, and Sandboxie. We have MSE installed and updated, and all windows updates applied.
They won't stop pestering me about a firewall. I've told them that, since we have a NAT router and Sandboxie, a firewall is basically unneeded, as the router itself has excellent security. We pass GRC's SheildsUP! Test (https://www.grc.com/x/ne.dll?bh0bkyd2
with flying colors.
My aforementioned debate is this: If you're using a sanboxing program, a decent antivirus, and a NAT router, is a software firewall necessary? If yes, should it be for all cases? Or just under certain circumstances (expand in a comment)?
~~If you're so good with computers, how come you're paying me 300 dollars to fix it?~~