• Valid program


    This is a valid program that is required to run at startup.

    This program is required to run on startup in order to benefit from its functionality or so that the program will work. The following information is a brief description of what is known about this file. If you require further assistance for this file, feel free to ask about in the forums.

  • Name
  • Filename
  • Command
    %programfiles%\[Nuance or Scansoft]\PDF [rest of program name]\pdfpro[version]hook.exe
  • Description
    Added by various PDF products by ScanSoft now Nuance, this file must run to prevent trial watermarks from appearing on PDF documents.

    Version numbers include:  3, 4, 5, 6 and 7

    Note that pdfpro5hook.exe will appear in the following filepath if you have a Dell 1355 Multifunction Color Printer:

    %programfiles%\Dell Printers\Dell 1355 Multifunction Color Printer\PDFViewer\pdfpro5hook.exe

    This appears to be the case only with version 5 and only with this printer.
  • File Location
    %programfiles%\[Nuance or Scansoft]\PDF [rest of program name]\pdfpro[version]hook.exe
  • Startup Type
    This startup entry is started automatically from a Run, RunOnce, RunServices, or RunServicesOnce entry in the registry.
  • HijackThis Category
    O4 Entry
  • Note
    %ProgramFiles% refers to the Program Files folder. The path to this folder is C:\Program Files\ or C:\Program Files (X86)\ depending on whether the version of Windows or the program being installed is 32-bit or 64-bit.
  • This entry has been requested 15,084 times.


It is assumed that users are familiar with the operating system they are using and comfortable with making the suggested changes. BleepingComputer.com will not be held responsible if changes you make cause a system failure.

This is NOT a list of tasks/processes taken from Task Manager or the Close Program window (CTRL+ALT+DEL) but a list of startup applications, although you will find some of them listed via this method. Pressing CTRL+ALT+DEL identifies programs that are currently running - not necessarily at startup. Therefore, before ending a task/process via CTRL+ALT+DEL just because it has an "X" recommendation, please check whether it's in MSCONFIG or the registry first. An example would be "svchost.exe" - which doesn't appear in either under normal conditions but does via CTRL+ALT+DEL. If in doubt, don't do anything.

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