do not use the shift key to type upercase letters ... when entering the key
it is not necessary to enter them as uppercase. typeing "a" will be entered
as "A"
Chris;
Exactly when are you getting this message?
If you are getting it while installing Windows XP:
Look carefully, O-0, G-6, I-1, S-5 and others look alike.
Have someone else try, sometimes another set of eyes and fingers can
get it correctly.