msaccess.exe is the executable for Microsoft Access, a database application included in Microsoft Office. This program is non-essential process to the running of the system, but should not be terminated unless suspected to be causing problems, doing so may inadvertently damage any databases open.
Non-system processes like msaccess.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