To add another language
Open Regional and Language Options in Control Panel.
On the Languages tab, under Text services and input languages, click Details.
Under Installed services, click Add.
In the Input language list, click the language you want to add.
Select the check box for the type of text service you want to install, if multiple options are available, and then click a service in the list.
If Keyboard Layout/IME is the only type of service available, click an option in that list.
To open Regional and Language Options, click Start, click Control Panel, click Date, Time, Language, and Regional Options, and then click Regional and Language Options.
Add an input language if you want to insert or display text in that language. You must select at least one text service, such as a keyboard layout or Input Method Editor (IME), when you add a new language.
Add only those languages you will use. Each language you add is loaded into memory when you start your computer and can affect performance.
If the Language bar is displayed, you can right-click the Language bar and then click Settings to open the Text Services and Input Languages dialog box.