If you don't already have a decompression program, download and install Win Rar from the download section.
Decompress the haks and layo v19 files
Find your NWN program files and open them - you'll see folders with names like hak erf local ...
Open your now decompressed hak and v19 folders and place the files in the appropriate NWN folders.. Haks in hak.. music in music etc. Tou may not have a .tlk folder in the NWN files so go ahead and create one and place the .tlk file in it.
Probably clear as mud, but hope it helps