It also depends on if you have a router in between your computer and the internet, and what your security settings are, what your level of control is, etc. I personally dont run any software firewall or A/V while I'm logged into AH, but then I am reasonably certain I am safe without them due to my network setup. If I'm accessing the internet via a browser, I have full software and A/V protection running as well as a port monitor on my router. Again, thats just me. You do what you feel you have to do to be safe.