Aren't you supposed to be booting from the boot diskette (the floppy)? Wasn't that why you made one?
Also, boot from CD is failing-- Did you remove the CD? Is your BIOS set to boot from CD, then HDD, then floppy?
As I see it, what is supposed to be happening (or rather what you were trying to do) was to set it up so that if you have the floppy in, you get a menu allowing you to boot Linux, and if there is no floppy then Windows should boot normally from its own bootloader.
But.... you made a boot floppy before installing LiLO, so that can't work (insofar as LiLO isn't on the floppy, which it would need to be for that to work), and LiLO is installed to root, so it can't be found from the bootloader on the MBR. If in fact anything is installed to the MBR, which at this point is a good question.
Sorry, I'm working this out as I go along.
If I was you, I would boot from the Slack CD and either use a recovery tool (sorry, don't have my Slack CDs in front of me atm) or do a reinstall and install LiLO to the MBR, which would give you the menu to choose Windows or Slack on boot (which you already seem to know how to configure).
Are you certain that hda6 is the correct partition? That is the other possiblity.
Hope this helps to some degree, sorry it's not more