KB Article: http://support.microsoft.com/kb/2597033

INTRODUCTION

When you try to type a dot symbol (.) in a text box or in a page note in a PowerPoint 2010 presentation, a comma (,) is typed unexpectedly. This issue occurs when the following conditions are true:

• The format of the region on the computer is set to French (France) or French (Belgium).
• You set an AZERTY French mapped keyboard that uses a dot symbol as the decimal separator on the numeric keypad as your keyboard. For example, you set a French (Belgian) keyboard or a French (Default) keyboard as your keyboard.