Acer Aspire M5800/M3800 crashes when playing games


Sep 23, 2012
My stationary Acer crashes when I play games for like 3 mins(ex. The Sims 3, Civilization V etc.) It kind of goes to digital saving mode, and its still on, but screen is black. And if i had music it would lagg.

This started a half year ago, when I updated the graphics card (NVIDIA). I did the auto-detect graphic card on NVIDIAs site and downloaded the recommended one. But then started the troubles.

Iv'e tried these thing:

- Restored computer to factory settings
- Clean the fan inside computer (due to overheat, but don't know if that's the problem)

Here are the computer specs:

Operating system: Windows 7 Home Premium 64-bit (6.1 build 7601)
System manufacturer: Acer
system model: Aspire M5800/M3800
BIOS: Default system BIOS
Processor: Intel Core 2 Quad CPU q8300 2.50GHz (4CPUs), ~2.5GHz
Memory: 6144MB RAM
Video card: NVIDIA GeForce GT 320

Does anyone know what the problem might be ? I'm not so good w computers..