Go to <Control Panel>
From within the Control Panel, double-click
<Keyboard>
Click on the <Language> tab (Windows 95/98)
or the <Input Locals> tab (Windows NT). In the window, select
<English (United States)>. (Note the layout listed for it on the right side
of the window)
Click on <Properties>, and from the menu
select US-International. Click
<OK>, and note
that the layout for <English > has changed from (United States) to (US-International). Click on
<Apply> - you will be asked to insert the Windows installation CD.
After the files have been copied, click on
<OK>.
You should now be able to use the US-International keyboard layout.
1) In the Control Panel folder, click on "Regional and Language options"
2) Select the "Languages" tab, and then click the "Details" button. This brings up "Text Services and Input Languages"
3) On the "Settings" tab of the new window, click on "Add.." . This brings up the "Add Input Language" window.
4) Input language should be English (United States). Click to checkmark the "Keyboard layout/IME" radio box, and in the drop-down box, select "United States
- International". (If it's already installed, it won' t be there). Click on OK, click on Apply then OK on the Text Services and Input Languages window, and
click OK on the Regional and Languages Options window.
5) You should now see a small keyboard icon on the lower right part of your display, just to the left of the System Tray and just to the right of the "EN"
English keyboard indicator (Fig 1 below). Alternatively, if you have the Microsoft Language Bar open, it will be at the top of your display (Fig 2 below). You
need to select the "United States - International" option.
Test the results in Windows Notepad by holding down the RIGHT Alt key on your keyboard and typing the vowels "a e i o u" and you
should get these results: á é í ó ú . Note that you must use only the RIGHT Alt key - the left one will NOT work for this.

Fig 1

Fig 2