sysui.dll is a PowerCinema System to UI Module for Dell
belonging to PowerDVD for Dell
from CyberLink Corp.
Non-system processes like sysui.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.