The system locale determines the default character set (letters, symbols, and numbers) and font that you use to enter information and that are used to display information in programs that do not use Unicode. This allows non-Unicode programs to run on your computer using the specified language. You might need to change the default system locale when you install additional display languages on your computer. Selecting a different language for the system locale does not affect the language in menus and dialog boxes for Windows or other programs that do use Unicode.
Open Regional and Language Options by clicking the Start button , clicking Control Panel, clicking Clock, Language, and Region, and then clicking Regional and Language Options.
Click the Administrative tab, and then, under Language for non-Unicode programs (System Locale), click Change system locale.
If you are prompted for an administrator password or confirmation, type the password or provide confirmation.
Select the language, and then click OK.
To restart your computer, click Restart now.