windows xp and office xp

I installed office xp on my computer that has 4 users - 2
are administrators and 2 are kids
The two administrators are able to use word, excel etc.
but the other 2 users (kids) do not have access. When you
click the icon it goes to an install screen-then you have
to use the administrator password and install. Then is
says installation completed successfully, but when you try
to get into the program - the same thing happens
what do i do to resolve this?? We all need access to
these programs