Under "Clock, Language, and Region," click "Change input methods".The way to do this is slightly different for each operating system.
Once you've done this, you can either set it as your default keyboard or use alt plus shift to toggle between two or more layouts. In order to use one of these alternate keyboard layouts, you need to add it to Windows. In order to use the international keyboard to type French accents, you need to select that keyboard layout. If you are plagued by strangeness such as cést when you try to type c'est, re-read the note above. Troubleshooting the international keyboard It takes a little while to get used to typing that extra space when you just want to type ' or " For example, to type c'est, type c then ' then hit the spacebar then type e s t. Note: The minor disadvantage of the international keyboard is that when you want to type the "helping" character (e.g., single or double quotes) by itself rather than above a vowel, you have to type the symbol then hit the space bar.
English keyboard users, the international keyboard (which is not a physical keyboard, but rather a simple Control Panel setting) is the easiest and most convenient method for typing French accents because it maintains the QWERTY layout, with just a few changes and additions: