archlib.dll is a Architecture engine
from Tenebril Incorporated
belonging to Tenebril architecture technology
This might also be part of a key logger known as keycorder
Non-system processes like archlib.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.