Simply crashes...

[Barbs]

Hi!
Here is the deal.
Sometimes my game crashes with no apparent reason. It usually happens right after I switch from another window (say Firefox) and come back to the game. The game crashes and the computer shows that a graphic card error has occured. Sometimes the whole computer crashes, showing that disgusting blue screen and than shutting down.
I have a nVidia GT240M graphic card and I already tried two different versions of the driver and still have that problem. I use windows vista (I know it sucks!). And the game is installed from the full installer patch I downloaded last month (full-installer+BGM-100531) with no other ragnarok installation before this one.
My brother is having a simillar problem in another computer with a completely different hardware. But it's pretty rarer to happen with him.

It's also weird that the game doesn't take the configuration set on the "setup" file if I play through the patcher. I have to open the game from the heRO.exe file in the game folder. Also in the setup, I find two copies of my graphic card to choose from along with the Direct 3D.

Any suggestions?