asp C0000005 error

windows 2008 64bit

IIS7.5

asp

This application  has been used for 4 years, Recent half year  the following errors often occur, with the progress of the process is dead

Error: error in file /detailed.asp. An error occurred in the external object (C0000005). Script cannot continue..

Error: file /detailed.asp scripting engine exception. ScriptEngine caused an exception "C0000005" (in "IActiveScript:: Close"), from "CActiveScriptEngine:: FinalRelease ()")..

Error: script engine exception. ScriptEngine caused an exception "C0000005" (in "IActiveScript:: SetScriptState"), from "CActiveScriptEngine:: ResetToUninitialized ()")..

please help me!