If you don't know how to do it, then how do you know such a thing
exists? Maybe you're getting an error message, and this is part of the
error message? Maybe if you quoted the entire error message exactly and
completely, someone here might be able to give you better help than just
answering a vague out-of-context question?
See
http://support.microsoft.com/?kbid=290527 "How to add or remove a
single Office XP program or component".
As a guess, you might also see
http://support.microsoft.com/?kbid=839132
"'There are no Office Assistant character files present' error message
when you start an Office XP program".
