HELP!..how can someone stop the RUN AS pop-up from appearing

Archived from groups: microsoft.public.windowsxp.perform_maintain (More info?)

everytime I click on any program or application the RUN AS
pop-up window appears asking me which user account do I
want to use to run this program? It gives CURRENT USER or
the option to use my USER NAME, ADMINISTRATOR and another
name I have listed as a user. I only have 3 different user
accounts to access my computer (all of which have
administrators rights. Anyway long story short.. I'm
guessing it has something to do with a security setting.
(there's a set of keys pictured w/another option box that
says "Protect my computer and data from unauthorized
program activity. This option can prevent computer viruses
from harming your computer or personal data, but selecting
it might cause the program to function improperly." I just
don't know what setting to change or fix. Please help!
I'd be so greatful! XPPro User w/SP2 installed