I am not entirely sure, I haven't found a thread which implies how to remove it, but I will continue searching.
-EDIT- I found this thread which lists a few various ways to attempt to removing it, hope it helps :
Well, I went into the Taskbar Notification Settings (settings for which icons should appear in the taskbar notification area). This is the screenshot: Link
It says Main. Still found no way to remove it.
Okay, what I did was take the image of the icon you showed, cropped it a bit and used the very handy google search by image with the cropped png file. The software is called All-in-one key logger. This is the description of its functions:
Features: Web Logging
E-mail, FTP, LAN delivery
Disable Anti-Keylogger / Unwanted Software
Block Unwanted URL’s
Filter Monitored User Accounts
Log files Encryption