You can try this maybe:
Click Start, point to Settings, and then click Control Panel.
Double-click the Regional Options icon.
In the Regional Options dialog box, click to select the check box for the language to which you want to change.
Click the Set default button.
In the Select System Local dialog box, click the language that you want, and then click OK.
In the Regional Options dialog box, click Apply.
Click Yes when you are prompted with the following message: