Booting to Dos to perform Virus scan

I have a number of NT4 workstations infected with a virus. To clean them I need to boot to MSDOS to run the AV software. None of the machines have MSDOS loaded. I have ERD Commander but it cannot run the application at command line.
How can I get these machines to boot up with MSDOS without loading MSDOS on each machine. There must be a boot floppy isn’t there??