Alien,

I spent time trying to do exactly the same thing. I ended up making a bootable CD with F-Prot's DOS based virus scanner.

Works almost perfectly. I tried editing the FINDCD command to launch f-prot.exe on startup but wasn't succesful however I can still type it in from the command line and it runs great. Another, similiar work around would be for you to burn just F-Prot (with latest definitions) to CD and then boot from a floppy with CD support and go from there.