stacsv.exe is a C-Major Audio Service from SigmaTel, Inc. belonging to C-Major Audio.
stacsv.exe uses excessive system and memory resources with no corresponding benefit. Applications such as these should be disabled to improve overall system performance.
Non-system processes like stacsv.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