Windows 7 using French AZERTY keyboard special characters problem

You can use the same keyboard combinations as on OS X to create accented characters. Here are the commands for each:

• ⌥+` then a=à
• ⌥+e then a=á
• ⌥+u then a=ä
• ⌥+i then a=â
• ⌥+n then a=ã

After you press the ⌥ (option/alt key) combination, the accent character will show up. Then, typing the next character will replace the accent with the accented character, if possible. If the character you type cannot have that accent, the accent will stay, followed by the character.

The Apple-supplied driver have been overwritten probably by a Windows update. After I reinstalled the Apple Bootcamp Drivers, the problem was solved for me.