Seting up network. Problem with Administrator.

Hello,
I recently tried to set up my network and am having
problems. I think that my problems revolve around my use
of Administrator. I am running XP professional and when I
installed XP it seems that I set up all of my programs
and daily use to run only when loged in as administrator.
If I do not log in as administrator I can not complete
boot. I am not able to switch users. When I go to Control
Panel and check the users tab I show different users as
well as a guest profile which shows that it is active,
however I can not access any of the other users. Is there
a way to correct this problem and still maintain all of
the programs and files I have installed to the
administrator mode, understanding that certain admin.
function.
Is it possible that my problems with my network setup
working is caused by the above mentioned?
Thank You,
Brad