I've fussy about what I install and always monitoring size/date modified files (in Explorer sort by modified or use dir/od). I prefer to use DOS AV as everything is installed in 1 folder or so and nothing is added to the registry. I'm not one to install this or that application just for something different -- you know these screensavers or utility programs unless I need to and I don't. According to some if you close the ports, unbind NetBIOS over TCP/IP, practise safe hex, scan with good AV/AT, and esp. use a dynamic IP/56k dial up there's less chance of attacks and firewalls aren't always needed (alt.comp.virus). I'm still interested in what I maybe sending out/getting in. So which firewall is best and will leave the least change to my files when I install. As it's a Win program the registry will be changed. Windows95A, P150, 80MB, personal home standalone use.