Command line arguments supported by C&C Generals: Zero Hour

To get C&C Generals and Zero Hours running in Windows 7, download the most update DirectX drivers from Microsoft first. The DicrectX 8.1 driver bundled with installation disks is problematic.

It is not possible to run the game in XP mode of Windows 7.

Answers by microsoft about the problem that XP mode in Windows 7 cannot play 3D games:

"The Windows XP Mode virtual machine doesn't have a real video card.  The virtual PC software simulates an old S3 Trio card, and there's no way to change it."