Getting the scripts to work:
First, make sure you have the file open where the scripts reside. Navigate to the C drive on your computer.
Now, this is a little confusing. For some computers, the scripts folder is in one place, and on other machines its in another. So to be safe, just put the 4 scripts in both the following places:
C:\Program Files (x86)\Adobe\Adobe Photoshop CS3\Presets\Scripts
C:\Program Files\Adobe\Adobe Photoshop CS3\Presets\Scripts
If you are missing one of those locations, don't sweat it. That just means you only have one option to pull scripts from.
When you open Photoshop, you'll see the scripts posted in the File --> scripts menu.