Apparently, I have Rome Gold Edition installed. Which I don't I checked my steam and its not on there (It may be my brothers account that has it) But I installed RTW on the disks. Which for some reason I cannot install patch 1.5 Because "Apparently RTW Gold Edition is installed on this computer" Even though I have Disk's from like 2008-07-06 or when ever.

How do I get pass this error?