In terms of game file size, you need to have at least 6 GB of free disk space available. The minimum memory requirement for Half-Life 2 is 512 MB RAM installed on your computer. Provided that you have at least one NVIDIA GeForce 6200 graphics card you can play. At least an Intel Pentium 4 2.00GHz CPU is required to run Half-Life 2.
Half-Life 2 System Requirements (Minimum)
Processor: Intel Pentium Single-core 1.7 GHz
RAM: 512 MB
Operating System: Windows 7, Vista, XP
Graphics: Intel Accelerated
PIXEL SHADER: 2.0
VERTEX SHADER: 2.0
Game Installation Size: 6500 MB