Supporting Windows

Hello everybody,
I've changed the regional language of me computer on control panel -> Regional and Language Options and I need on advanced tab, match the box 'apply all settings to the current user and to the default user profile', but I've faced some difficults to set it because when I match this box, apply and close regional settings, next time I open it the box is not set anymore...
Does anybory knows some registry can I change?Or some other way to do it..
I tried to find it out at google but I found just how to fix it in windows server 2003 SP1

my OS is windows XP Professional...

Thanks in advance