Merely copying the command.com and command .sys won't make your systems boot n the floppy drive. In a machine with a windows 98 Os, open a DOS prompt then key in " sys A: " this will copy the boot system in drive A: if this will not work go to c:\windows\command then type " sys A: " then copy fdisk.exe from c:\windows\command to drive A: then on the machine where you installed linux, configure the BIOS to boot in Drive A: first in the boot sequence then SAVE your settings. Try then to boot, if its success then type fdisk /mbr