Hi i have a problem after boot with N1 disk and putting N2 disk and pressing the enter in this message:Insert N2(filesystem) floppy and press after by this(pressing enter) the system is reboot!! why??? 
my old pc is a Pentium II 333mhz 3gb hd 64mb ram
please help!! 
What prompted you to re-install the operating system? Do you have a DOS boot diskette, will the system boot to an A: prompt? Try the N1, N2 disk combination in another Pentium System, to see if you can get to the initial installation menu, don't go into the hard drive initialization.
To saw and other systems! Again reboot do before go to install!