Solve Error The remote procedure call failed. (Exception from HRESULT: 0x800706BE) in Microsoft.Office.Interop service

This solution is with respect to WSS 3.0 and MOSS 2007 This error usually come when your machine or server where MOSS 2007 or WSS 3.0 is installed has not application pool identity rights in "IIS WAMREG admin Service" in dcomconfig.add application pool identity to launch and activation permission. Note:when you are using Microsoft.office.interop service in Workflow ,there is chances of this error.Because your application pool identity is NETWORK Service user by default and workflow run under system account ,so this time you need to change application pool identity Network service user to system account.