Mitel Your Assistant Error on XP SP2

This is the error

System.ArgumentException: Delegate to an instance method cannot have null 'this'.
at System.MulticastDelegate.ThrowNullThisInDelegateToInstance()
at NewHeights.YA3.MainWindowController.OnBootProgress(ProgressEventArgs args)
at NewHeights.BootStrapper.BootManager.ProgressEventHandler.Invoke(ProgressEventArgs args)
at NewHeights.BootStrapper.BootManager.OnProgress(ProgressEventArgs args)
at NewHeights.BootStrapper.BootManager.Shutdown(ArrayList bootables, BootableType bootableType)
at NewHeights.BootStrapper.BootManager.ShutdownImpl()
at NewHeights.BootStrapper.BootManager.Boot()
at NewHeights.YA3.MainClass.Start(BootManager bootman)

My PC is XP SP2, after a Restore to factory settings I installed Mitel Your Assistant, it wouldn't even load up.

Simple fix, install .net Framework 1.1!

Why this is needed as the product states .net 1.1 and later, it should say you can runany version of the .net framework, as long as you install 1.1 as well.