Guild Wars 2

ok so now i downloaded logged in worked great for about 8-10mins and then the screen went black but i can still here the sound. Hmm was looking forward to doing an all nighter.
Any help on this issue would be great.

sorry yes 750 little typo currently at 79% downloaded so really keen to get on and see if this fixed the problem, if not $600 spent still well but little dissapointed that its not fixed but once downloaded will let you know if my problems have been fixed and will hopefully be online alot more

thanks it got the best of me doing alot of research on it all and decided to upgrade so now a good case might have to put some more cooling into it just to be safe.
I built that computer many years ago never really upgraded it.
I have no upgraded to below
Asrock H97M Pro4 motherboard
Intel Core I5 4460 3.2Ghz 6MB CPU
Gainward GW-GTX250-2G Graphics Card
8GB Stick of Ram
since I put my hard drives into it from my old computer I had to reinstall windows 8.1 which also made me reinstall GW2
I am still waiting but according to the system requirements test it has made a massive difference. Even the guy at the computer store was a little jelous.

So anyway I have played GW2 on and off for a while now and have found that my computer screen goes black every so often when playing and i have to restart GW2.
I thought this was a software problem so i re installed and repaired ect but nothing, then i got thinking about my computer where i ran tests using the can you run it website and it says I can so it has me stumped.

I have been thinking about upgrading my computer a bit using parts from MSY.

the list of my computer as is now.
Pentium® Dual-Core CPU E6500 @ 2.93GHz
NVIDIA GeForce GT 610
Windows 8.1 64bit
6Gb Ram

I need and will be getting a new case most probably
Thermaltake V4 Mid Tower Case Black Edition with 500W PSU

Any help would be helpfull.
Located Northern NSW Australia