Helo!
during the slackware instalation, when I wanted to configure LILO I saw this error:
Sorry, but the attempt to install LILO has returned an error, so LILO has not been corectly instaled. You will have to use a bootdisk to start your mashine instead. It shud still be possible to get LILO working by editing the /etc/lilo.config and reinstall LILO.

And now I boot my computer with bootdisk, and when I want configure LILO I see this error message!

Sorry for my english

could you post what's in your lilo.conf? what other operating systems are on the computer? does it have one hard drive, or more than one?

# LILO configuration file
# generated by 'liloconfig'
#
# Start LILO global section
lba32 # Allow booting past 1024th cylinder with a recent BIOS
boot = /dev/hda
message = /boot/boot_message.txt
prompt
timeout = 1200
# Override dangerous defaults that rewrite the partition table:
change-rules
reset
# Normal VGA console
vga = normal
# VESA framebuffer console @ 1024x768x64k
# vga=791
# VESA framebuffer console @ 1024x768x32k
# vga=790
# VESA framebuffer console @ 1024x768x256
# vga=773
# VESA framebuffer console @ 800x600x64k
# vga=788
# VESA framebuffer console @ 800x600x32k
# vga=787
# VESA framebuffer console @ 800x600x256
# vga=771
# VESA framebuffer console @ 640x480x64k
# vga=785
# VESA framebuffer console @ 640x480x32k
# vga=784
# VESA framebuffer console @ 640x480x256
# vga=769
# End LILO global section
# DOS bootable partition config begins
other = This
label = DOS
table = This
# DOS bootable partition config ends
# Linux bootable partition config begins
image = /boot/vmlinuz
root = /dev/hda3
label = Linux
read-only
# Linux bootable partition config ends

I have one drive and one operating system.
I did one DOS partition 7M, but LILO does not work too!

change to:
other = /dev/hda1 (or wherever your dos partition is)
label = DOS
table = /dev/hda


then run lilo again as root:
$ su <enter>
$ <enter password>
# lilo

then try to boot again.