I was wondering what you folks used as a portable antivirus. Whether it is a bootable Antivir CD, a usb install of ClamWin, or something else. What do you use for a portable antivirus? Personally I use a usb copy of AntiVir with a scripted updater. Since according to AV-Comparatives most antivirus software is close to 99% effective on-demand anyways AntiVir seems to scan more quickly than others. Skipping the obvious risks of running from USB I've been keeping my eye open for a usb stick with a read-only switch.