Ok yeah, so i figured out for windows 2003, you need the corporate or enterprise edition of NAV, so yeah i got 'Nav Corporate 7.60 Client Build 926', ok but yeah when im installing it.. it seems to go through everything [thiers like the status bar] and when it reaches the end, it sais 'rolling back' and the bar goes backwards, and it sais 'NAV setup was interrupted, please try and install it again' or sumthen like that ive tryed it like 10 times, and it sais the same thing every time, Any help guys?