mcscript_inuse.exe is a process associated with McAfee common framework used by various McAfee products from Network Associates.
This process should not be removed to ensure that your system is secure.
Non-system processes like mcscript_inuse.exe originate from software you installed on your system. Since most applications store data in your system's registry, it is likely that your registry has suffered fragmentation and accumulated invalid entries which can affect your PC's performance. It is recommended that you
check your registry to identify slowdown issues.