Then ctfmon is found to be a trojan horse. This executable copies all my keystrokes and send it off to someone. Therefore, it steals confidential (eg. password) information from me!! Thanks God that I don't use this computer to do bank transaction.
After I removed this executable, my PC becomes faster instantly.
So, please do check your PC for trojan horse even when you have a anti virus software installed.
To run the System Configuration Utility, do the following: Start->Run->msconfig
To erase the file, you start up the computer in safe mode with command. This is done by pressing repeatably F8 when the computer just completed the BIOS startup. Select the appropriate startup option. When the Command window appears type:
Extracted from Neuber:
When you run a Microsoft Office XP program, the file Ctfmon.exe (Ctfmon) runs in the background, even after you quit all Office programs.
Ctfmon.exe monitors active windows and provides text input service support for speech recognition, handwriting recognition, keyboard translation, and other alternate user input forms. See How to uninstall CTFMON.EXE
Note: The ctfmon.exe file is located in the folder C:\Windows\System32. In other cases, ctfmon.exe is a virus, spyware, trojan or worm! Check this with Security Task Manager.