CRITICAL error

2009.10.13 20:25:05
OS : Windows XP 5.1 (Build: 2600)
CPU : AuthenticAMD PentiumPro-class processor @ 1805 MHz with 1023MB RAM
Video : ATI Radeon 9550 / X1050 Series (6542)

General protection fault!

History: NConsoleWnd::RequestAuthLogin <- NCAuthWnd::OnLoginBtnClick <- NControl::SendEventMessage <- NCButton::OnClickButton <- NCButton::OnLButtonUp <- NCVirtualWndMain::PassToFocusedWindow <- NCVirtualWndMain::PassToFocusedWindow <- NCVirtualWndMain::PassToFocusedWindow <- NCVirtualWndMain::DispatchWndMsg <- NConsoleWnd::DispatchWndMsgX <- NConsoleWnd::MasterConsoleEventProcess <- UEngine::InputEvent <- UWindowsViewport::CauseInputEvent <- UWindowsViewport::UpdateInput <- UViewport::ReadInput <- APlayerController::Tick <- ALineagePlayerController::Tick <- TickAllActors <- ULevel::Tick <- (NetMode=0) <- TickLevel <- UGameEngine::Tick <- UpdateWorld <- MainLoop

WHAT I MUST DO??