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HP Commercial Desktops - How to Fix a Mfehidk.sys Error

This document pertains to all commercial desktop computers using McAfee Antivirus on the Windows 7, Vista, or XP operating system.
Mfehidk.sys is a system process that runs in the computer background and maintains the host intrusion detection system for McAfee Antivirus.
Mfehidk.sys works in the same way that most antivirus programs do and uses large amounts of CPU memory. This can cause the computer to slow down or crash.
Figure : Mfehidk.sys Error
Image: Mfehidk.sys Error
Disable and Updated McAfee
To resolve this issue, disable McAfee, and then download the latest version of the McAfee software. There are two methods to disable McAfee.
Solution one: Disable McAfee through the System Configuration tool
Follow these steps to disable McAfee through the System Configuration tool, and then download the latest version of the McAfee software.
  1. Open System Configuration.
    • Windows 7 and Windows Vista
      1. Click Start , and then type msconfig in the Search field.
      2. Select msconfig.exe from the list of results. The System Configuration window opens.
    • Windows XP
      1. On the Windows taskbar, click Start , and then click Run.
      2. In the Open field, type msconfig, and then press Enter. The System Configuration window opens.
  2. Select the Services tab.
  3. Uncheck all McAfee services to disable them.
      note:
    Click Hide all Microsoft Services to make the McAfee services easier to find.
  4. Click the Startup tab.
  5. Uncheck all the McAfee related entries to disable them.
      note:
    Click Hide all Microsoft Services to make the McAfee services easier to find.
  6. Click Apply, and then click OK.
  7. Click Restart, if prompted to restart the computer.
  8. Download the latest version of McAfee.
Open Windows in Safe Mode
If the previous steps were not successful, restart the computer in Safe Mode, and then follow the steps to disable McAfee through the System Configuration Tool again.
  note:
Safe Mode is a diagnostic mode that allows you to use Windows with basic drivers. No extra software is loaded, so troubleshooting software and driver problems is much easier.
  1. Turn off the computer.
  2. Turn the computer back on, and press F8 repeatedly until the Windows Advanced Options Menu opens.
  3. From the Windows Advanced Options Menu, use the arrow keys to select Safe Mode, and then press Enter.
  4. When Windows restarts, repeat the steps from the previous section.
    The computer automatically exits Safe Mode when it is shut down.
Solution two: Rename mfehidk.sys in the Command Prompt tool
Follow these steps to disable mfehidk.sys by renaming the file in the Command Prompt tool, and then download the latest version of the McAfee software.
  1. Insert the system repair disc in the CD/DVD drive on the computer, and then turn off the computer.
  2. Turn the computer back on.
  3. If prompted, press a key to start the computer from the system repair disc.
  4. Choose your language settings, and then click Next.
  5. In the System Recovery Options window, click Next. The System Recovery Options tool opens.
  6. Select Command Prompt.
    Figure : Select Command Prompt
    Image: Select Command Prompt
  7. In the Command Prompt window, enter rename d:\windows\system32\drivers\mfehidk.sys d:\windows\system32\drivers\mfehidk.sys.bak.
    Figure : Command Prompt
    Image: Command Prompt
  8. Enter Exit.
  9. Download the latest version of McAfee.

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