ad2h264dec.dll is a ad2h264dec
belonging to MainConcept (Adobe2)® H.264//AVC Video Decoder Wrapper
from MainConcept AG
Non-system processes like ad2h264dec.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.