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Simply check that CTFMON.EXE boots at startup (for all users).
Use the following code (copy and paste to a .REG file) if you don't know how to add manually this executable to HKLM startup.

Code:

Windows Registry Editor Version 5.00

[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run]

"ctfmon"="CTFMON.EXE"