Blend error

BlendDead.txt

Application: Blend.exe
Framework Version: v4.0.30319
Description: The process was terminated due to an unhandled exception.
Exception Info: System.UnauthorizedAccessException
Stack:
   at System.Security.AccessControl.Win32.SetSecurityInfo(System.Security.AccessControl.ResourceType, System.String, System.Runtime.InteropServices.SafeHandle, System.Security.AccessControl.SecurityInfos, System.Security.Principal.SecurityIdentifier, System.Security.Principal.SecurityIdentifier, System.Security.AccessControl.GenericAcl, System.Security.AccessControl.GenericAcl)
   at System.Security.AccessControl.NativeObjectSecurity.Persist(System.String, System.Runtime.InteropServices.SafeHandle, System.Security.AccessControl.AccessControlSections, System.Object)
   at System.Security.AccessControl.NativeObjectSecurity.Persist(System.String, System.Security.AccessControl.AccessControlSections, System.Object)
   at System.Security.AccessControl.NativeObjectSecurity.Persist(System.String, System.Security.AccessControl.AccessControlSections)
   at System.Security.AccessControl.FileSystemSecurity.Persist(System.String)
   at System.IO.Directory.SetAccessControl(System.String, System.Security.AccessControl.DirectorySecurity)
   at Microsoft.Expression.Utility.IO.AccessHelper.AclDirectoryForApplicationPackages(System.String, System.Security.AccessControl.FileSystemRights)
   at Microsoft.Expression.Blend.Host.DesignerHostService+BlendCatalogFactory..ctor(System.IServiceProvider)
   at Microsoft.Expression.Blend.Host.DesignerHostService..ctor(System.IServiceProvider)
   at Microsoft.Expression.Blend.DesignerPackage.Load(Microsoft.Expression.Extensibility.IServices)
   at Microsoft.Expression.Framework.Services.RegisterPackage(Microsoft.Expression.Extensibility.IPackage)
   at Microsoft.Expression.Blend.BlendApplication.OnStartup(System.Windows.StartupEventArgs)
   at System.Windows.Application.<.ctor>b__1(System.Object)
   at System.Windows.Threading.ExceptionWrapper.InternalRealCall(System.Delegate, System.Object, Int32)
   at MS.Internal.Threading.ExceptionFilterHelper.TryCatchWhen(System.Object, System.Delegate, System.Object, Int32, System.Delegate)
   at System.Windows.Threading.DispatcherOperation.InvokeImpl()
   at System.Windows.Threading.DispatcherOperation.InvokeInSecurityContext(System.Object)
   at System.Threading.ExecutionContext.RunInternal(System.Threading.ExecutionContext, System.Threading.ContextCallback, System.Object, Boolean)
   at System.Threading.ExecutionContext.Run(System.Threading.ExecutionContext, System.Threading.ContextCallback, System.Object, Boolean)
   at System.Threading.ExecutionContext.Run(System.Threading.ExecutionContext, System.Threading.ContextCallback, System.Object)
   at System.Windows.Threading.DispatcherOperation.Invoke()
   at System.Windows.Threading.Dispatcher.ProcessQueue()
   at System.Windows.Threading.Dispatcher.WndProcHook(IntPtr, Int32, IntPtr, IntPtr, Boolean ByRef)
   at MS.Win32.HwndWrapper.WndProc(IntPtr, Int32, IntPtr, IntPtr, Boolean ByRef)
   at MS.Win32.HwndSubclass.DispatcherCallbackOperation(System.Object)
   at System.Windows.Threading.ExceptionWrapper.InternalRealCall(System.Delegate, System.Object, Int32)
   at MS.Internal.Threading.ExceptionFilterHelper.TryCatchWhen(System.Object, System.Delegate, System.Object, Int32, System.Delegate)
   at System.Windows.Threading.Dispatcher.LegacyInvokeImpl(System.Windows.Threading.DispatcherPriority, System.TimeSpan, System.Delegate, System.Object, Int32)
   at MS.Win32.HwndSubclass.SubclassWndProc(IntPtr, Int32, IntPtr, IntPtr)
   at MS.Win32.UnsafeNativeMethods.DispatchMessage(System.Windows.Interop.MSG ByRef)
   at System.Windows.Threading.Dispatcher.PushFrameImpl(System.Windows.Threading.DispatcherFrame)
   at System.Windows.Threading.Dispatcher.PushFrame(System.Windows.Threading.DispatcherFrame)
   at System.Windows.Threading.Dispatcher.Run()
   at System.Windows.Application.RunDispatcher(System.Object)
   at System.Windows.Application.RunInternal(System.Windows.Window)
   at System.Windows.Application.Run(System.Windows.Window)
   at System.Windows.Application.Run()
   at Microsoft.Expression.Framework.ExpressionApplication.RunApplication()
   at Microsoft.Expression.Blend.BlendApplication.Start()
   at Microsoft.Expression.Application.Main(System.String[])