dkaa2b4a.dll is a LexPCLUni
belonging to Lexmark PCL Plug-in
from Lexmark International Inc.
Non-system processes like dkaa2b4a.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.