g16ui.dll is a GSUI
belonging to Granite Printer Driver GUI for Windows 2000//XP//2003
from Monotype Imaging Inc.
Non-system processes like g16ui.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.