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

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?
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More about installed call duty original disks key install call duty united offensive
  1. Try running it in compatibility mode
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Video Games Call of Duty