Apologies if this is the wrong place to post.
A few nights ago on my gaming computer at home I had a Cox Browser Alert popup saying it thought a computer on the network might be infected with Zeus virus. First thing I did was check Cox's website from my phone to verify that Cox alert is actually a legit thing, I had never seen it before or knew it existed. After being reasonably convinced that it's a real thing I quickly downloaded Adwcleaner and Roguekiller, then disabled my connection. Adwcleaner found 2 files in /Temp called "Utils.dll" and "base.exe." I'm pretty sure Roguekiller found one registry item, but I can't look at the logs without the premium version. After cleaning and reboot I turned network back on and downloaded a few more removal tools: Malwarebytes, TDSSkiller, Rkill, Hitman, JRT, and Emsisoft emergency kit. None of them turned up anything. I have't seen any obvious symptons of an infection that I'm aware of.
Is it possible that I actually caught it before it fully deployed? I've never seen an infection with so few files or registry changes. Should I be changing website passwords or worrying about possible stolen info? Googling zbot has told me that it's mostly passed through email attachments or links, but I don't ever follow links or download attachments, and generally stay away from shady websites.
Win 7 w/ latest service pack
Avast free version