To type Spanish letters, you will need to hold down the "Alt" key 
found next to the space bar and the following numbers:
� (Alt - 160)
� (Alt - 130)
� (Alt - 161)
� (Alt - 162)
� (Alt - 163)
� (Alt - 164)
� (Alt - 168)
� (Alt - 173)

(Note:  Make sure that the "Number Lock" key is on and that you are 
using the numbers to the right of the keyboard.)