I did 'let knoppix do it' - mainly because I dont know how to make my own swap partition!
I'll search this site to see if there is a description of how to do it, if it means doing something destructive to Windows which is already on the drive then I will not be doing it - the fdisk suggestion seems to be 'destructive'.

Thanks - Mike

PS Does anyone know what the error message means - or is it DEFINITELY the swap partition?