T.T All l2w versions work on vista, IG/OOG... And why the hell you should disable the UAC Security Layer? It is the best way to get protected against viruses that delete system files ^^
Just, right click, RUN AS ADMINISTRATOR and that's it... Nothing more, nothing less... For both l2w.exe and emulator.exe
All programs need to have admin permissions, otherwise they won't run properly... Games, installers, everything! Even broswers and MSN ^^
If you don't click run as admin, they won't have the permission to edit any file under windows and program files folder... No write / modify permissions, only read..