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Forgot Windows VHD/VHDX Administrator Password?

VHD (Virtual Hard Disk) is a file format used by Microsoft Virtual PC to represent a virtual hard disk drive (HDD). Just like physical hard drive, you can install an operating system like Windows 8 into a virtual hard disk (.VHD/VHDX file). If you've forgotten the admin password for a Windows VHD/VHDX, you can reset the password offline with PCUnlocker, without having to start your virtual machine.

Just boot your physical computer from PCUnlocker Live CD (or USB drive), and then mount your VHD or VHDX file. The program can help you reset lost Windows VHD/VHDX administrator password easily.

1Create A PCUnlocker Live CD/USB

  1. Click here to download and save the PCUnlocker self-extracting Zip file to any computer that you have access to, then extract the ISO image file (pcunlocker.iso) from it.
  2. Download and install the ISO2Disc utility, launch the program.
  3. Click the Browse button to locate the PCUnlocker ISO image file, then click the Start Burn button to make a PCUnlocker Live CD or USB drive.

    Burn ISO Image to CD/DVD or USB flash drive

2Boot from PCUnlocker Live CD/USB

  1. Insert your burned CD (or USB drive) into the physical computer that your VHD or VHDX file is stored on.
  2. Turn on the computer and check the boot-screen for setup key (i.e. DELETE key, F8 key, F2 key) to enter BIOS Setup Utility.
  3. Use the arrow keys to select the BOOT tab, then change the Boot Device Priority: Set 1st Boot Device to CDROM if you've created a Live CD, or set 1st Boot Device to Removable Device if a USB drive was created.

    BIOS Setting

  4. Press F10 to save your changes. Now your computer should boot from PCUnlocker Live CD/USB.

3Reset VHD/VHDX Administrator Password

  1. If everything goes as expected, the computer will load the WinPE OS from the Live CD/USB drive, and eventually take you to the PCUnlocker program.
  2. Click on the Options button, and then select Mount Virtual Drive from the drop-down menu. When the file open dialog appears, locate your VHD or VHDX file and click Open.

    Locate VHD or VHDX file

  3. After mounting the VHD/VHDX file, click on the Browse button to choose the SAM registry file for the Windows system installed on your virtual drive. The program will list all your Windows accounts.

    Reset Windows Password

  4. Choose the administrator account and click on Reset Password button. It will unlock / remove your forgotten password immediately.
  5. Click Restart and remove the CD or USB drive, your computer will dismount the virtual hard disk and restart. Now you've successfully reset lost Windows VHD/VHDX password!

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