Guild Wars 2

Hey ive also had black screen problems since i bought the game i got a old pc but plays the game no lag on full graphics so seems like its new enough but i get the black screen after about 5-10 minutes every time

here is my specs any suggestions i pretty much tried everything
ive also linked the DXdiag.txt file

ECS GF7100/7050PVT-m3
intel quad 2 core Q8200 @ 2.33 ghz
4096 mb RAM (4GB ram )
palit nvidia geforce 9600 GT 2536 mb ram

ive got all the latest software
Windows 8
Direct x 11
latest Graphics update
and i also downloaded a software update program and it says all software up to date

also tryed many things like downloaded the pc temp checking program

pls help played a month of this game with black screen im really getting sick of re-opening the program every 5 minutes

Thanx for all help
AnTieViL