use your computer do download F-Prot for DOS.
put it on floppies and use a startup disk to boot to the command prompt. insert disk with f-prot.exe and type

f-prot.exe/loaddef it will prompt you to insert the disk with the virus deffinitions and then just scan your computer

go here http://www.f-prot.com/download/home_user/
go down untill you see f-prot for DOS download it AND the virus signature files that are under it