Using blender plugins...

I was wondering about how you use blender plugins that call methods not actually in the plugin file? I’m pretty new to blender and only have a basic knowledge of programming, so when I download plugins like Blender World Forge and SoundTracker and I try and run them, I have no clue for what to do about the “script error” message. I’ve installed python 2.6 and it still doesnt work…any help would be appreciated.