I've lost the ability to type upper case "M" and "K" on my main computer
running XP home version. I've tried different keyboards and checked for
viruses. I can't find anything on the net referring to this problem. I
have several user accounts on the computer, and strangely it happens only on
the administrator accounts and not any of the limited user accounts. It
happens in MS Word, note pad and any program that allows text entry. Has
anyone ever seen anything like this?
Thanks in advance,
Mark

Perhaps you have somehow set the keyboard language to some crazy
international layout? Try going to Control Panel, Regional and Language
Options, Languages tab, Details button.
In the 'default input language' box you'll see the language you're
currently using. If it's anything but US English, try setting it to
that and see what happens.

This would be consistent with your symptom happening only on the
administrator accounts: I think the keyboard layout is a per-user
setting. I can't imagine how this could have gotten set though ... I'll
be interested to see if this is the problem.