First, you want to get your dvd or cds from a
reliable source like the official mirror list.
This is the official torrent file.
I like
this USA mirror and sometimes I'll use the
Switzerland mirror. Both of them are very fast.
Using my DSL wireless connection I get the dvd in 3 - 4 hours.
Then you also need to get the md5 file for the downloaded iso file to check the iso file. Here's the
official md5 file for the Slackware 13 DVD.
QuickSFV is a light hand tool for that check.
I have Nero 8 but rarely use it preferring
IMGBURN.
7zip makes looking at iso file easy.
All of these are free and, I have found them to be rock solid programs.
I guessing that your cd burner is also a DVD ROM combo because a CD ROM can not read a dvd disk. In any case, you may want to check the jumper setting on your Optical Drives and make sure their set correctly, as well as, checking for updated firmware that maybe available for your Optical Drives. Also, check if your computer/motherboard has an updated bios available for it. If you can update the firmware/bios be careful: close all programs and windows that are open and make sure your not going to lose power in the middle of updating bios/firmware.
These are just some preliminaries that can lead to an easy install.
Looks like I took too long with this reply!