Why does my Macbook Pro crash almost immediately when I'm offline?

My Macbook Pro (late 2007 if i'm right) crashes randomly, whether I'm using a program or not. Suddenly the whole screen freezes (I see a black mouse and not the spinning ball of death). So I'm forced to use the hard restart.
It started a while ago, when I still was using Snow Leopard. So I did a clean install, and had to buy Mountain Lion. Ever since the clean install there were 3 software updates. But still I'm having the crash problem.
After this last update to 10.8.5 I'm noticing that when I turn WiFi off it almost immediately crashes. And sometimes when I reboot I don't have the time to turn on WiFi again or it already has crashed.
Though I remember that my mac also crashed when I was using the ethernet cable and when i was using WiFi. Only now with the offline modus it seems that crashing is the only thing he can do.
This is what I already tried:
-Making a second account as administrator and start up in the safe mode: but still crashes when I go offline.
-using disk utility to veridy and repair disk permissions: all good.
-NVRAM reset
-SMC reset
I don't know what kind of information anyone needs, but:
Processor 2,2 GHz Intel Core 2 Duo
Geheugen 4 GB 667 MHz DDR2 SDRAM
Videokaart NVIDIA GeForce 8600M GT 128 MB
Software OS X 10.8.5 (12F45)
And my harddrive has 56 gb free right now.

Thank you for your fast answer.
Even though I don't understand the connection between working offline and my videocard I believe you because I see sometimes blocked images when something tries to load or when i scroll down, mostly in photoshop. So I'm considering buying a new computer.
I tested my harddrive a while ago and it still seemed ok. (still i back up all the important stuff constantly).
Though I wanted to ask if you know if the Nvidia is a part of my logic board. I had my logic board replaced in 2010 because of an Nvidia error. So that part isn't that old. Still I can imagine that it doesn't work well anymore with other hardware or software on my computer.

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