My computer is an Emachines e730 , i found an old driver on the Intel website but when i try to install it say , The system doesn't have the minimun system requirements , so now i don't know what to do , i need this driver only because i wanna transform this laptop in a retro gaming laptop (kind of...) and the other problem is that my XP doesn't see the 4GB of ram.

Driver for Intel HD2000: https://downloadcenter.intel.com/product/81502/Intel-HD-Graphics-2000

I looked for a description of the laptop, and often on this model is installed ATI Mobility Radeon HD 5470 graphics card.

4GB of memory 32 bit XP does not see. The maximum is 3.5GB. Here is an article why this is happening, and what workarounds are there.