Trados Studio 2024 fails to launch - I've tried everything

I'm using Trados Studio 2024 with Windows 11. A few days ago I just couldn't launch Studio again. All went well until the stage when Studio was supposed to create the project window. Then it just disappeared and nothing happened. I've followed practically every step on this forum to correct the issue (repair, delete/rename files, reinstallation), but the result is the same: Studio just won't launch. With my limited computer competence there's nothing I can do any more. The error message in today's log reads as follows (the parts in Finnish say: [System.ArgumentException: An item with the same key has already been added and --- End of internal exception pile (?) tracking ---):

FATAL [2025-06-06 09:31:13,908] Sdl.Desktop.Platform.UnhandledException - Service 'Sdl.Desktop.Platform.CommandBars.IActionService' could not be started.
Sdl.Desktop.Platform.Services.ServiceStartException: Service 'Sdl.Desktop.Platform.CommandBars.IActionService' could not be started. ---> System.ArgumentException: Saman avaimen sisältävä kohde on jo lisätty.
   kohteessa System.ThrowHelper.ThrowArgumentException(ExceptionResource resource)
   kohteessa System.Collections.Generic.Dictionary`2.Insert(TKey key, TValue value, Boolean add)
   kohteessa System.Collections.ObjectModel.KeyedCollection`2.AddKey(TKey key, TItem item)
   kohteessa System.Collections.ObjectModel.KeyedCollection`2.InsertItem(Int32 index, TItem item)
   kohteessa System.Collections.ObjectModel.Collection`1.Add(T item)
   kohteessa Sdl.Desktop.Platform.Implementation.CommandBars.ActionService.OnStart()
   kohteessa Sdl.Desktop.Platform.Services.AbstractService.Start(IServiceContext context)
   kohteessa Sdl.Desktop.Platform.Implementation.Services.ServiceContext.GetLocalService[T]()
   --- Sisäisen poikkeuksen pinon jäljityksen loppu ---

Can someone make any sense of this and help me resolve the issue? I'm getting desperate.

Best regards

Tarja

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