NAV 7 Web Client - error when trying to open web client

Dear,

As in the following blog post : viewtopic.php?f=32&t=53505

I've troubles to connect to the web client when using windows authentication.

Here are the messages I get:



And after refresh:



Here is what appears in the Application event viewer:

Type: System.UnauthorizedAccessException
Message: Access to the registry key 'Global' is denied.
StackTrace:
     at Microsoft.Win32.RegistryKey.Win32Error(Int32 errorCode, String str)
     at Microsoft.Win32.RegistryKey.InternalGetValue(String name, Object defaultValue, Boolean doNotExpand, Boolean checkSecurity)
     at Microsoft.Win32.RegistryKey.GetValue(String name)
     at System.Diagnostics.PerformanceMonitor.GetData(String item)
     at System.Diagnostics.PerformanceCounterLib.GetPerformanceData(String item)
     at System.Diagnostics.PerformanceCounterLib.get_CategoryTable()
     at System.Diagnostics.PerformanceCounterLib.CategoryExists(String machine, String category)
     at System.Diagnostics.PerformanceCounterCategory.Exists(String categoryName, String machineName)
     at System.Diagnostics.PerformanceCounterCategory.Exists(String categoryName)
     at Microsoft.Dynamics.Framework.UI.WebBase.Diagnostics.CounterExistsPerformanceCounterEnabledStrategy.get_IsEnabled()
     at Microsoft.Dynamics.Framework.UI.WebBase.Diagnostics.SystemPerformanceCounter.Increment()
     at Microsoft.Dynamics.Framework.UI.WebBase.ClientSessionManagerBase.OnClientSessionCreated(ClientSessionCore createdSession)
     at Microsoft.Dynamics.Framework.UI.ClientSessionManagerCore.CreateClientSession(String sessionId)
     at Microsoft.Dynamics.Framework.UI.ClientSessionManagerCore.EnsureSession(String sessionId)
     at Microsoft.Dynamics.Framework.UI.Web.ClientSessionManager.EnsureSession()
     at Microsoft.Dynamics.Framework.UI.Web.FormControl.OnInitCore(EventArgs e)
     at Microsoft.Dynamics.Framework.UI.Web.FormControl.<>c__DisplayClass3.<OnInit>b__2()
     at Microsoft.Dynamics.Framework.UI.Web.WebEventExecutor.<>c__DisplayClass3.<Execute>b__2()
     at Microsoft.Dynamics.Framework.UI.Web.WebEventExecutor.ExecuteCore[T](Func`1 webEvent, Func`1 condition)
Source: mscorlib

Type: System.ArgumentNullException
Message:
  Value cannot be null.
  Parameter name: key
ParamName: key
StackTrace:
     at System.Collections.Generic.Dictionary`2.FindEntry(TKey key)
     at System.Collections.Generic.Dictionary`2.TryGetValue(TKey key, TValue& value)
     at Microsoft.Dynamics.Framework.UI.WebBase.WebSessionStateProvider.Unregister(ClientSessionBase clientSession)
     at Microsoft.Dynamics.Framework.UI.WebBase.ClientSessionManagerBase.OnClientSessionRemoved(ClientSessionCore removedSession)
     at Microsoft.Dynamics.Framework.UI.ClientSessionManagerCore.RemoveClientSession(ClientSessionCore clientSession)
     at Microsoft.Dynamics.Framework.UI.ClientSessionCore.Dispose(Boolean disposing)
     at Microsoft.Dynamics.Framework.UI.WebBase.ClientSessionBase.Close()
     at Microsoft.Dynamics.Framework.UI.Web.ClientSession.OnExitProcessing()
     at Microsoft.Dynamics.Framework.UI.WebBase.ClientSessionBase.ExitProcessingCore()
     at Microsoft.Dynamics.Framework.UI.WebBase.ClientSessionBase.ExitProcessing()
     at Microsoft.Dynamics.Framework.UI.Web.FormControl.UnloadCleanup()
     at Microsoft.Dynamics.Framework.UI.Web.FormControl.<OnUnload>b__17()
     at Microsoft.Dynamics.Framework.UI.Web.WebEventExecutor.<>c__DisplayClass3.<Execute>b__2()
     at Microsoft.Dynamics.Framework.UI.Web.WebEventExecutor.ExecuteCore[T](Func`1 webEvent, Func`1 condition)
Source: mscorlib

I've tried the following:

Complete reinstall of IIS, NAV Web Client, whole NAV features.
Rebuild of Performance counters
Edit registry to allow access to performance counters

It sure has something to do with the fact that I use windows logins (permissions missing?)

Thanks for your help