我为Microsoft Office
Word构建了一个加载项。当以Word管理员身份运行时，使用外接程序没有问题，但是，如果未以管理员身份运行该外接程序，则有两个常见的例外访问功能区元素。

第一个例外：

Unable to cast COM object of type 'System.__ComObject' to interface type 'Microsoft.Office.Core.IRibbonUI'. This operation failed because the QueryInterface call on the COM component for the interface with IID '{000C03A7-0000-0000-C000-000000000046}' failed due to the following error:  could not be found. (Exception from HRESULT: 0x80030002 (STG_E_FILENOTFOUND)).
   at Microsoft.Office.Core.IRibbonUI.InvalidateControl(String ControlID)

通过以下代码使控件无效时，将发生此错误：

ribbon.InvalidateControl("control-id");

还有第二个例外：

Unable to cast COM object of type 'Microsoft.Office.Interop.Word.ApplicationClass' to interface type 'Microsoft.Office.Interop.Word._Application'. This operation failed because the QueryInterface call on the COM component for the interface with IID '{00020970-0000-0000-C000-000000000046}' failed due to the following error:  could not be found. (Exception from HRESULT: 0x80030002 (STG_E_FILENOTFOUND)).
   at Microsoft.Office.Interop.Word.ApplicationClass.get_Selection()

在以下代码的最后一行上会发生此错误：

object wdStory = Word.WdUnits.wdStory;
object wdMove = Word.WdMovementType.wdMove;
WrdApp.Selection.EndKey(ref wdStory, ref wdMove)

我该如何解决这个问题？