In case if you are encountering launching issues, we recommend trying to check SimCity 4 Launcher, which you can download from here:
Alternatively we recommend trying to run the game in windowed mode. In order to do that navigate to the game's installation folder and find the Launch SimCity 4 Deluxe Edition shortcut, or use the desktop shortcut. Right-click on the shortcut, and select Properties. In Properties window, switch to Shortcut tab, and here go to the end of Target field. To the existing line please add:
-CPUCount:1 -w -CustomResolution:enabled -r1280x720x32
If the game was installed to C:\Program Files (x86)\GalaxyClient\Games, then the whole Target field should look like this:
"C:\Program Files (x86)\GalaxyClient\Games\SimCity 4 Deluxe Edition\Apps\SimCity 4.exe" -CPUCount:1 -w -CustomResolution:enabled -r1280x720x32
Press Ok, to save changes and start the game using modified shortcut.
Please have in mind that you can freely modify the values in -r1280x720x32 command, and if you would like to run the game in windowed mode in 1600x900 resolution, simply change the command to -r1600x900x32.