no mate u dont.
maybe im stating the obvious and this is what youve done already, but you simply unzip the contents of the resfix .rar/.zip into the main directory, ie c\program files\ubisoft\silent hunter 3. you dont need any new folder/subfolder, so the 2 batch files, the .cfg file, .dll file - ie all of them - sit DIRECTLY in \silent hunter 3 by themselves, NOT within any subfolder. it should then just be a case of running the setup batch file and adjusting the .cfg file.
like i said, sorry if this is what youve already done. if it is, i use xp, so maybe its an issue with vista, which i cant help u with
good luck
