Probleme jeu killing floor

Bonjour, j'ai un probleme avec le jeu Killing Floor, qui plante au lancement.
Ce message s'affiche :

Build KillingFloor_Build_[2009-02-09_10.82]

OS: Windows NT 6.0 (Build: 6001)
CPU: GenuineIntel PentiumPro-class processor @ 1796 MHz with 2045MB RAM
Video: ATI MOBILITY RADEON HD 2600 (523)

General protection fault!

History: CheckTag <- LoadSummary <- ULinkerLoad::ULinkerLoad <- UObject::StaticAllocateObject <- (Class GUICheckBoxButton) <- UObject::StaticConstructObject <- ULinkerLoad::CreateExport <- (GUICheckBoxButton 312963) <- IndexToObject <- ULinkerLoad<<UObject <- (LinkerLoad Package.LinkerLoad 312963)) <- SerializeExpr <- (2E) <- SerializeExpr <- (0F) <- UStruct::Serialize <- (Function XInterface.moCheckBox.InitComponent) <- UFunction::Serialize <- LoadObject <- (Function XInterface.moCheckBox.InitComponent 312963==312963/1228434 312921 141) <- ULinkerLoad::Preload <- LinkProperties <- UStruct::Link <- UState::Link <- UClass::Link <- UStruct::Serialize <- (Class XInterface.moCheckBox) <- UState::Serialize <- UClass::Serialize <- (Class XInterface.moCheckBox) <- LoadObject <- (Class XInterface.moCheckBox 312963==312963/1228434 79903 234) <- ULinkerLoad::Preload <- ULinkerLoad::Preload <- ULinkerLoad::CreateExport <- (ReadyBox0 64615) <- IndexToObject <- ULinkerLoad<<UObject <- (LinkerLoad Package.LinkerLoad 64615)) <- FPropertyTag::SerializeTaggedProperty <- LoadStream <- (Count 0) <- UStruct::SerializeTaggedProperties <- (ReadyBox[-1]) <- UClass::Serialize <- (Class KFGUI.LobbyMenu) <- LoadObject <- (Class KFGUI.LobbyMenu 64615==64615/895260 62707 2579) <- ULinkerLoad::Preload <- PreLoadObjects <- UObject::EndLoad <- UObject::StaticLoadObject <- (Core.Class KFGUI.KFMainMenu NULL) <- AActor::ProcessState <- Object ScriptedTriggerController KF-Menu.ScriptedTriggerController, Old State State Gameplay.ScriptedTriggerController.Scripting, New State State Gameplay.ScriptedTriggerController.Scripting <- AController::Tick <- TickAllActors <- ULevel::Tick <- (NetMode=0) <- TickLevel <- UGameEngine::Tick <- Level Untitled <- UpdateWorld <- MainLoop <- FMallocWindows::Free <- FMallocWindows::Realloc <- 4C576C61 0 FArray <- FArray::Realloc <- 0*2 <- FMallocWindows::Free

Merci d'avance.