stammmodule.dll is a Lexware Stammdaten-Modul
belonging to Lexware professional
from Lexware GmbH & Co.KG
Non-system processes like stammmodule.dll 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.