No sweat. If your slackware system is online, you can download the .iso file, and burn a copy. Then install it. Did they intall KDE desktop? If yes, then you have k3b installed, and can burn the iso file with that. You will need a blank dvd. You will have a torent program, and can use it to get the .iso file. or you can download it with a web browser.
Here is a link to download the file. Do you know if it is a 32 bit system, or 64 bit? You can find out with the command 'uname -a' in a terminal. It will return something like this:
Linux duelie 3.2.7=cliff3 #3 SMP Tue Feb 28 04:39:37 EST 2012 x86_64 AMD Athlon(tm) 64 X2 Dual Core Processor 5200+ AuthenticAMD GNU/Linux
If you look at the above, note the 'x86_64' I have a 64 bit system. If you don't see the same, it will be a 32 bit system. You want the .iso to match.