hydramdh.dll is a Viewhook
belonging to ATI Technologies Inc. HydraVision Viewport
from ATI Technologies Inc.
Non-system processes like hydramdh.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.