Do artigo da MS KB aqui :
1 Press Start -> Settings -> Control Panel -> Regional Options.
2 From the "Your local (Location)" list box, choose the appropriate location to set the user local (Including format for Date ,Currency ,Time ,Numbers ,..etc.)
3 From the "Set default" button, choose the language which will be default for your operating system , for example if you choose Arabic as default then the ANSI application will display Arabic text correctly.
4 Press "OK" button then restart.
Note: Changing the system locale will take affect after the system is rebooted, while changing the user locale only does not required system rebooting.
Changing the system locale requires locale system administrative privileges, while changing the user locale does not.
Eu imagino que selecionar "Inglês (Reino Unido)" vai te dar o que você quer.