點加cpu ram同System RAM呀?

我想知道點點加cpu ram同System RAM呀
我想玩gta iv
但係cpu ram同System RAM又唔夠
又唔想洗錢買第2個cpu
咁點加呢?
我係去左can you run it?個網check
佢咁講
CPU
Minimum: Intel Core 2 Duo 1.8GHz, AMD Athlon X2 64 2.4GHz
You Have: Intel(R) Pentium(R) 4 CPU 2.40GHz

CPU Speed
Minimum: 1.8 GHz
You Have: 2.39 GHz

System RAM
Minimum: 1 GB for Windows XP / 1.5 GB for Windows Vista)
You Have: 503 MB

Operating System
Minimum: Windows Vista - Service Pack 1 / XP - Service Pack 3
You Have: Microsoft Windows XP Professional (Build Service Pack 32600)

Video Card
Minimum: 256MB NVIDIA 7900+ / 256MB ATI X1900+
You Have: Intel(R) 82845G/GL/GE/PE/GV Graphics Controller (Intel(R) 82845G Graphics Controller)

Video Card Features - Minimum attributes of your Video Card Video RAM: Required - 256 MB , You have - 64 MB
Video Card 3D Acceleration: Required - Yes , You have - Yes
Video HW Transform & Lighting: Required - Yes , You have - No
Vertex Shader Ver.: Required - 3.0 , You have - 0.0
Pixel Shader Ver.: Required - 3.0 , You have - 0.0

Video Card Driver Version (DirectX)
Your driver version number is: 6.13.10.3510

Sound Card
Minimum: Yes
You Have: Realtek AC97 AudioSound Card Driver Version
Your driver version number is: 0.0

Free Disk Space
Minimum: 16 GB
You Have: 19.6 GB

我想知點改同改左對部電腦有冇害呀?