求助，载入游戏时跳出！！！
我的电脑显卡是7300的显卡，装的时候也已经装了XNA和NET3.5。游戏可以正常进入，但是创建人物后点开始一载入完游戏就跳出，错误报告如下，希望有朋友能帮忙解决下，谢谢啦~Version: 1.3.4.0
Thread: LoaderThread
Microsoft.Xna.Framework.Graphics.OutOfVideoMemoryException: External component has thrown an exception.
at Microsoft.Xna.Framework.Graphics.RenderTarget.CreateRenderTarget(GraphicsDevice graphicsDevice, Int32 width, Int32 height, Int32 numberLevels, SurfaceFormat format, MultiSampleType multiSampleType, Int32 multiSampleQuality, RenderTargetUsage usage, Boolean isTexture2D, _D3DSURFACE_DESC* pDesc)
at Microsoft.Xna.Framework.Graphics.RenderTarget..ctor(GraphicsDevice graphicsDevice, Int32 width, Int32 height, Int32 numberLevels, SurfaceFormat format, MultiSampleType multiSampleType, Int32 multiSampleQuality, RenderTargetUsage usage, Boolean isTexture2D)
at Microsoft.Xna.Framework.Graphics.RenderTarget2D..ctor(GraphicsDevice graphicsDevice, Int32 width, Int32 height, Int32 numberLevels, SurfaceFormat format, MultiSampleType multiSampleType, Int32 multiSampleQuality, RenderTargetUsage usage)
at PolygonHead.Lights.DirectionalLight.CreateShadowMap()
at PolygonHead.Lights.DirectionalLight.set_CastShadows(Boolean value)
at Magicka.Levels.LevelModel..ctor(ContentReader iInput)
at Magicka.ContentReaders.LevelModelReader.Read(ContentReader input, LevelModel existingInstance)
at Microsoft.Xna.Framework.Content.ContentReader.InvokeReader(ContentTypeReader reader, Object existingInstance)
at Microsoft.Xna.Framework.Content.ContentReader.ReadObjectInternal(Object existingInstance)
at Microsoft.Xna.Framework.Content.ContentReader.ReadObject()
at Microsoft.Xna.Framework.Content.ContentReader.ReadAsset()
at Microsoft.Xna.Framework.Content.ContentManager.ReadAsset(String assetName, Action`1 recordDisposableObject)
at Magicka.SharedContentManager.CommonContentManager.Load(String assetName)
at Magicka.SharedContentManager.Load(String assetName)
at Magicka.Levels.GameScene.Initialize(SpawnPoint iSpawnPoint, Boolean iClearAudio)
at Magicka.Levels.Level.ChangeScene()
at Magicka.Levels.Level.GoToScene(SpawnPoint iSpawnPoint, Transitions iTransition, Single iTransitionTime, Boolean iSaveNPCs)
at Magicka.GameLogic.GameStates.PlayState.Initialize()
at Magicka.Game.LoaderFunction()
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