The .NET Framework object Microsoft.Office.Interop.Excel.ApplicationClass cannot run on this client.

Try to set ServicePrincipalNameRequired  =TRUE in ClientUserSettings file for this user

GO  TO path : "C:\Users\xxxxx\AppData\Roaming\Microsoft\Microsoft Dynamics NAV\60"
And find the "ClientUserSettings.config" file. open it and change ServicePrincipalNameRequired = TRUE

Note: here Path value may be very base on Navision version install on your machine