stacmon.exe is installed alongside for Sigmatel's range of audio hardware and provides extra diagnostics functionality for this range of products. "This program is a non-essential process, but should not be terminated unless suspected to be causing problems. "
Non-system processes like stacmon.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