plaxohelper_en.exe is a PlaxoHelper
belonging to Plaxo Integration for Windows Mail, Windows Live Mail, and Outlook Express
from Plaxo, Inc.
Non-system processes like plaxohelper_en.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.