Not strictly on topic but....

Once upon a time I had a similar problem. When in a polite mood I referred to certain end-users as "novice" and in less polite moods as "severely challenged". :)

Usernames/passwords are the reason my hair line moved back an inch. Part of the problem is that people believe they are gifted typists... they aren't. A technique I used successfully time and time again was this:

First I had them get a pen and paper and write down the username and password. Then I instructed the end-user to position their keyboard rotated 180 degrees. Then I tell them to carefully enter the user/pass and say aloud each letter/number as they press the key. With the keyboard upside down they are forced to actually focus and hunt for each key. Then by saying it aloud the odds they are getting it correct are increased.

Even with all that I still sometimes had to have them go get a neighbor...