run the setup in expert mode, I pressed F1 then typed 'text expert'. When it comes to installing the bootloader it brings up a list of where you can install it MBR, hda ..etc.
If floppy isnt on that list, then put it anywhere except the MBR (this is where your windows bootloader is). You must create a boot floppy though, otherwise ...well you know... The option for it is there somewhere, the last thing if I remember