I haven't installed either KotOR yet on my new win7 rig (ME2 time ;) ) I have had it installed and working with mods on win7x64.
Astrotoy7 or Evil Q might be able to better help you in the Workbench area, but I will see if I can recall correctly...
You must have, of course, installed the game as an administrator, and also installed any subsequent mods as an admin. Everything must be done as an admin, so do it preemptively by right-clicking to "Run as administrator". For proper installation of the games in Vista/7, please see The Workbench Vista/7 Install Guide (
http://lucasforums.com/showthread.php?t=194324). To Astro and Q listen you should, hehhehe.
The other part of this puzzle is to make sure that your game folder is not marked as Read Only. Go to your game folder, usually C:/Program Files/Lucasarts/...
I would stop your navigation at the Lucasarts folder. Any LA games you have will need patching ( :ugh: ) so you may as well unlock them all... Go to folder properties, and un-tick the "Folder is Read-Only" box. This should apply automatically down the line to all sub-folders, ie swkotor, but double check and make sure that the game folders are no longer read-only.
Then, IIRC, you should be good to go!
EDIT: if the mod seems to install just fine with the exception of that file, this is not a problem. Simply go into the tslpatchdata folder of the RH mod, and copy the bast_lghtsbr1.uti from the patchdata folder to your override. :)