UBCD UpdaterMirrorUltimate Boot CD
is a freeware tool that contains several DOS base AV scanner. However these scanners are usually out of date when you download the file, for them to be effective they need keeping upto date.
I've created a update bat file that will correct this issue and it will update the following before creating a new ISO, McAfee, F-Prot, AntiVir and Avast Unfortunately I can't figure out how to update AVG as there updates are in a bin file that doesn't seem to be able to be accessed other than by the AVG software. If anyone does know a way round this please let me know.