pctfw.exe is a Tray Module
belonging to PC Tools Firewall Plus
from PC Tools
. This is a free personal firewall for Windows.
Non-system processes like pctfw.exe 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.