What causes ctfmon.exe error?

ctfmon.exe runtime error appear on my PC frequently

The ctfmon.exe file is mis-deleted by mistake.Once the ctfmon.exe file is deleted incorrectly, you will get numerous ctfmon.exe error messages after every system startup.
Virus attacks.Viruses are able to attack the exe files in the system or make change to Windows registry then result in ctfmon.exe error.
The computer is infected by spyware which attempts attempt to sabotage your computer resources and cause errors in existing files.
Program conflicts.Sometimes, the exe files of different genuine applications may conflict with each other and may lead to exe errors.
Incorrect program