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Lt. Commander
Join Date: Dec 2007
Posts: 120
# 3
02-03-2010, 10:28 AM
the product key isnt required to install STO its only used to activate your account with cryptic

what OS are you using?

if your using vista or win7
makesure youve logged on as your admin account, the first account you crate on your PC has admin level access
use the 'run as administrator' to start the installer
disable or in win7 lower the UAC level
if your installing STO to program files try creating a folder outside program files and install in there ie C:\games\cryptic\sto