I have installed Call of Duty 2 with original disks and key. Trying to install Call of Duty United Offensive. Says it can't va Tags: Video Games Call of Duty Last response: January 11, 2014 6:14 PM in Video Games Share JWRockman January 11, 2014 6:09:42 PM I have installed Call of Duty 2 with original disks and key. Trying to install COD United Offensive but error comes up and says can't validate COD2 installation. What can I do to fix this and install COD UO? More about : installed call duty original disks key install call duty united offensive IRONBATMAN January 11, 2014 6:14:30 PM Try running it in compatibility mode m 0 l Can't find your answer ? Ask ! Publish Related resources Call of duty united offensive how to install it Forum Call of Duty 2 won't install on Windows 7 Forum Call Of Duty 2 failed to start install Forum Call of duty 2 install problem Forum Call of duty 2 install problem Forum Call of duty 2 error during installation Forum Call of duty 2 installation problems Forum Instaling call of duty2 Forum More resources Read discussions in other Video Games categories Console Gaming PC Gaming Handheld Gaming Nintendo Playstation Servers Sims World of Warcraft Xbox 360 !