Edit: Had this typed up when sami posted/
That folder is not on a DVD, it os on your HDD.
You click on your HDD if you can boot in or get into is and go to the Extra folder and look for the Extensions folder there and go into that to remove the kext you need to remove.
Turn off show all files, lets make this easier to find.
Click on Finder.
With Finder open click on your Snow Leopard drive on the left side in the list
With that you should see your Extra Folder and click it
Now you will see your Extensions Folder and now click that.