So, same problem here
I'm on Vista:
I'm on Vista:
SPOILER
Intel(R) Core(TM)2 Quad CPU Q9400 @ 2.66GHz 2.67GHz
System.InvalidOperationException: Begin cannot be called again until End has been successfully called.
à Microsoft.Xna.Framework.Graphics.SpriteBatch.Begin(SpriteBlendMode blendMode, SpriteSortMode sortMode, SaveStateMode stateMode, Matrix transformMatrix)
à Microsoft.Xna.Framework.Graphics.SpriteBatch.Begin(SpriteBlendMode blendMode, SpriteSortMode sortMode, SaveStateMode stateMode)
à #Lm.#sp.#8Fb(Boolean )
à #Lm.#sp.#Ms()
à #Vl.#Yo.#0tb()
à #5i.#4i.#Ms()
à #rb.#xb.#Ms()
à #1h.#0h.#Ms()
à #rb.#xb.#7s()
à #rb.#xb.#it(Object , EventArgs )
à #rb.#Bb.#Dt()
à #rb.#Rb.#Sv(Object , EventArgs )
à System.Windows.Forms.Application.ThreadContext.System.Windows.Forms.UnsafeNativeMethods.IMsoComponent.FDoIdle(Int32 grfidlef)
à System.Windows.Forms.Application.ComponentManager.System.Windows.Forms.UnsafeNativeMethods.IMsoComponentManager.FPushMessageLoop(Int32 dwComponentID, Int32 reason, Int32 pvLoopData)
à System.Windows.Forms.Application.ThreadContext.RunMessageLoopInner(Int32 reason, ApplicationContext context)
à System.Windows.Forms.Application.ThreadContext.RunMessageLoop(Int32 reason, ApplicationContext context)
à System.Windows.Forms.Application.Run(Form mainForm)