If you want to write in Irish--or any other foreign language--which uses marks on letters which are not in our English alphabet, create something called "Sticky Keys." Click here to find out how (We strongly suggest printing this out and keeping it handy for easy reference):
Another option is to change the keyboard on your computer. Go to " Start," then "Control Panel," then "Regional and Language Options," click on the "Languages" tab, click on "Details," then on "Settings" tab, go to and click on "English (United States)" then in "Keyboard" click on "United States International", click "Apply," then "OK."
Again, it is strongly suggested that you print out the US International Keyboard (below) and keep it handy: