Minimum System Requirements:
OS: Windows XP/Vista
CPU: 800 MHz Intel Pentium III or AMD Athlon
RAM: 128 MB RAM or higher (Windows Vista requires 2 GB RAM)
HDD: 1400 MB free disk space or more
Graphics: 32 MB or higher
DirectX: Version 9.0c

Recommended System Requirements:
OS: Windows XP/Vista
CPU: 1.8 GHz Intel Pentium IV or AMD Athlon
RAM: 256 MB RAM or higher (Windows Vista requires 3 GB RAM)
HDD: 1.4 GB free disk space or more
Graphics: 32 MB or higher
DirectX: Version 9.0c

Download Links:
Download Command And Conquer Generals Zero Hour