Game crashes when changing options

Hello GGG and other members.

I recently got this problem where I can't change my graphic-options without that my game crashes. Say for example that I want to change my game to windowed mode and click 'save', the game crashes down and I get to windows and have to restart the game.

Same thing happens when i 'tab' down the game and for example wants to read something at the forum etc.

Why is this happening to me? Its so annoying and I cannot fix it.

Would love a fix for this.

Computer specs
- Amd athlon dual core +5000 2,6 ghz
- 3 gb ram
- GeForce 520 GT 2gb memory

Can it have something to do with my computer? Yes I know the specs arent good and im thinking of an upgrade but please, this should really work with PoE and not crash 5-10 times a day.

Thanks,

Edit:
Going to try make an PackCheck and will tell you guys the result when its done.