Installing additional language keyboard in Windows Vista is preety simple.
You can install additional language keyboard during installation itself. To install additional language keyboard such as Hindi (or say, arebic,) after Windows Vista installation, Click on Program menu, and then open Control Panel. Further, open Regional and language options. On the settings window that appears, click on Keyboard and languages tab. then click on Change Keyboards.... button. In the General tab, click on Add button. A list of hundreds of available keyboard will appear to select. Hunt for your language keyboard and select it by checking the selection box against it. You can select as many keyboards as you wish. finally, click OK and click Apply and you are done. You can preview the keyboard layout prior to select it by clicking Preview button.