Game randomly Crash (15 time/day)

Hi all,
First of all sorry for my bad english.
Im a new Lineage 2 user, i play with 5 friends and im the only one with that problem:
The game randomly crash with Game protections failure :(
My computer is freshly formated.
I got:

AMD 2600+
1gig ram DDR 400 Corsair
Motherboard Qbic 3702
Chipset nForce 2
2x120 gig 7200 ide
GeForce 6600 128mo

WinXP SP2 updated
All drivers are fresh !

So the game randomly crash expecially in towns for exemple i can bash mobs for hours in NoS and then SoE to Gludin and crash after 1 min in the town.
i could be AFK or moving,buying etc its the same, i got the sames error.
Next time the game crash ill put the commons errors.
I have made some tests and i think if i press the P button (graphic minimum) i get less crash, but im not sure !
i dont know how to do but i cant stay and play a game like this :( Plz help !

Here is a common error i got:

OS: Windows XP 5.1 (Build: 2600)
CPU: AuthenticAMD PentiumPro-class processor @ 1923 MHz with 1023MB RAM
Video: NVIDIA GeForce 6600 (8198)

General protection fault!

History: FilterActor <- InitializeLists <- SetupActors <- RenderLevel <- FLevelSceneNode::Render <- FPlayerSceneNode::Render <- UGameEngine:Draw <- UWindowsViewport::Repaint <- UWindowsClient::Tick <- ClientTick <- UGameEngine::Tick <- UpdateWorld <- MainLoop

C4 is a crash fest......

everyone is getting all kinds of errors......

The only advice I can give is close the new system window. The new one that appears over the old chat box. You can disable it in the options. I did that and my disconnections dropped from once every 1-2 hours to once a day at most. Big difference.