Downloaded the trial version and wow it's really really fast when compared to other DOS scanners and it's under 1.44 MB at 1.23 MB so can go on a floppy. 5 files and ignoring the TXT, 3 files. How neat and tidy is that! NOD32DOS EXE 223,787 NOD32 000 1,052,225 README TXT 884 LICENSE TXT 16,799 NOD32 CFG 24 However I can't find a link from www.nod32.com where you can get updates (NOD32.000 is the virus def file?). If seems you have to download the whole noddosen.exe http://www.nod32.com/download/download.htm ----- There's no /doboots option on the menu so does this need to be invoked on the command line e.g. nod32dos /doboots http://www.nod32.com/products/img/sdos01.jpg I believe that only F-PROT for DOS is 100% free; - all other DOS scanners are for a trial period only?