Hey, I recently bought Age of Empires III Complete collection and I've been getting error 1158 over and over again when trying to install the War Chiefs expansion. I scoured the internet for a solution, yet, no dice. I have a Genuine Windows 7 OS and I
was wondering if this could be the problem.
I would suggest you to install the game in Windows Vista compatibility mode and check if that helps.
Refer the following link to install the program in compatibility mode.
‘Make older programs run in this version of Windows’