Diacritical signs

Sorry, but in fact may question concerns Word 2003.
How do I type French letters ?; ?; ?; ?; ?; ?; ?; ?; ?; from the keyboard? I know how to insert them as symbols. The recommended combinations Ctrl+6, and a letter do not seem to work.
?, ?, ?, ? work perfectly when pressing a key. But those that I have mentioned…
Please, help.
Thank you in advance.
My OS is Windows XP.