Blender continously crashes

Hello community,

some time ago I installed blender on my Mac. I have Mac OS 10.5.3 4gb of ram, 2Ghz Intel Core 2 Duo, and this Graphic Card:
Intel GMA X3100:

Chipset Model: GMA X3100
Type: Display
Bus: Built-In
VRAM (Total): 144 MB
Vendor: Intel (0x8086)
Device ID: 0x2a02
Revision ID: 0x0003
Color LCD:
Resolution: 1280 x 800
Depth: 32-Bit Color
Core Image: Hardware Accelerated
Main Display: Yes
Mirror: Off
Online: Yes
Quartz Extreme: Supported
Built-In: Yes
Display Connector:
Status: No Display Connected

If I open blender and try to work with it it closes unexpected, also theres no error message. This happened every time I used it and I already googled it and searched solutions, didnt find anything. I use blender 2.49.2.

Thanks in advance