Just go to the FTP and grab base.i, install.1, and install.2
Then use rawrite like this:
Insert first floppy
C:\Windows\Desktop> rawrite base.i a
Insert floppy number 2
C:\Windows\Desktop> rawrite install.1 a
Insert floppy number 3
C:\Windows\Desktop> rawrite install.2 a
Exit the command prompt.
OK, now restart your system with the base.i floppy in the floppy drive. Now when it greets you, simply press enter. When you ARE PROMPTED, put in install.1 floppy and press enter. When prompted again, put install.2 floppy in and hit enter. Now type in root, and hit enter. Welcome to linux prompt!
Now you can set up your partions and install Slackware. Refer to http://Slackware.com
for details of this part.
I assumed that you have trouble as either Don't know what BIOS is/how to change it OR your bios doesn't boot CD's.