datalayer.exe is a process belonging to Nokia PC Suite.
It is a collection of tools used to synchronize and manage data and settings on the phone with your PC.
Non-system processes like datalayer.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