1.On your windows machine click on start and in the (Search for programs and files) box type in regedit and open regedit.exe
2. Next click on the little arrow next to the folder named HKEY_LOCAL_MACHINE and make your way to ergc directory. The full path is HKEY_LOCAL_MACHINE -> SOFTWARE -> Wow6432Node -> Electronic Arts -> EA Games -> Command and Conquer Generals Zero Hour -> ergc [or something along those lines, it may be slightly different for TUC].
3. Click on the ergc directory and right click on Default (located on the right side under Name) and Modify it.
4. Now simply add the - between the serial numbers.Write it exactly how its written on the game you bought. if you notice It only displays your serial number without the - between the code so you will just need to add them in for example change it from 123A5678B8CDD3D3P0P0 to 123A-5678-B8CD-D3D3-P0P0
5. Now try playing
