they should make this a sticky. the installer puts the scripts in a hidden folder. first hit start - control pannel (in the grey section on the right) - folder options - view (tab on the top of the popup) - about 9 check boxes down will be “show hidden files and folders” turn that on. should be easy to spot because it has a round instead of square check box. now hit apply and ok at the bottom.
ok now hit start - computer - c drive - users - what ever user - AppData - Roaming - Blender Foundation - Blender - .blender - scripts.
there is an easier way tho. uninstal blender. download meta’s blender that comes with all the scripts and stuff prepacked in it. it’s a loaded version of 2.49a that uses puthon 2.5. so if you dont have python 2.5 download and install it from here : http://www.python.org/download/releases/2.5.4/
either way you go after you have put the script in the proper folder
then download meta’s build from here: http://graphicall.org/builds/builds/showbuild.php?action=show&id=1060 and unzip it, then right click on the blender exec (will have the little blender icon with the name Blender is you dont show file extensions) then pin it to the start menue to open it from your start button, create a quick launch to put it on the task bar next to the start buton, or create a shortcut to put a clickable icon on your desktop. the folders will always be exactly where you unzipped them to. if you need a program for unzipping i recomend 7 zip. http://download.cnet.com/7-Zip/3000-2250_4-10045185.html
it beats hunting thru all the hidden files and folders and reduces the chances of a kid going into the hidden stuff and crashing your computer. you also dont have to hunt for and download scripts since everything you will ever want and more are already included. actually i just looked and the exporter you want isn’t in meta’s but you can easily put it in the scripts - py_export_249 folder the script is a python 2.4 script that should run in python 2.5 and will crash in python 2.6 versions (an easy way to tell is to look for print in the script. if it says[ print “what ever” ]it is python 2.5. if it says [print (“what ever”)] it is python 2.6 or higher.)
either way you go after you have put the script in the proper folder open blender and go to the scripts window. next to the little snake in the lower left you will see the word scripts, click on it and go all the way to the top of the menu that pops up and click on update menues.