In Microsoft Windows, click the Start button, and then click Control Panel.
Open the Regional and Language Options dialog box.
Do one of the following:
In Windows Vista, click the Formats tab, and then click Customize this format.
In Windows XP, click the Regional Options tab, and then click Customize.
Type a new separator in the List separator box.
Click OK twice.
NOTE After you change the list separator character for your computer, all programs use the new character as a list separator. You can change the character back to the default character by following the same procedure.