you do not have sufficient permission to run this exe, while installing MS CRM 2011

while installing MSCRM 2011, i was installing with minimum (MS CRM 2011 installation with minimun credential).
So while running the command "..../serversetup.exe /config config.xml" , then i got error you do not have sufficient permission to run it.
even if i had local admin privilege to the server.
then i ran the windows command window as "run as administrator", then put the command in th command prompt , then it started working... :P

thanks,
yes.sudhanshu