Perhaps, it was in Windows 8 or when I was getting early builds of Windows 10, but no matter what I did, I couldn’t get Windows 10 to change the pre-login background screen that was selected at some point. It was stuck on the stock cave beach image of img100.jpg and it eventually drove me crazy.

The image I was stuck with on boot in Windows 10 for many months… the dreaded img100.jpg

Windows 10 only rendered the image at reboot or before I logged-into the laptop. After I logged-in, any screen lock or wake from sleep used my background image setting. It might be stuck on a different image of the stock ones from Windows 8 or 10 on your laptop. It always bugged me, but finally I had to do something about it. There are numerous posts on the web on how to handle this or variants of this. I always assumed there was just a problem because of the beta nature of the earlier Windows 10 builds and eventually it would work itself out. It never did.

All the various tricks on the web to change the background and lock image in Windows 10 didn’t work for me. All the regedit hacks, search and destroy ideas out there were of no help for me to kill this pre-login background screen. But, I finally killed it. Here is what I did.

  1. Make sure you have folder item view options to show hidden and system protected files.
  2. Go to C:\ProgramData\Microsoft\Windows and right-click SystemData if it exists.
  3. Change ownership of SystemData so you can full control it.
  4. Under SystemData, I had a couple of subfolders2016-05-14_13-19-06
  5. Under the S-1-5-18 folder, there was a Read-Only folder
  6. In that folder, there was an odd little “LockScreen_Z” folder with three images of that img100.jpg pic. 2016-05-14_13-23-32
  7. I moved that LockScreen_Z folder out to the desktop and did a reboot and I was freed from the image!

For some reason, Windows 8.x or 10 created this C:\ProgramData\Microsoft\Windows\SystemData\S-1-5-18\ReadOnly\LockScreen_Z directory that held on to that pre-login screen image no matter what I tried to do via regedit or via deleting every img100.jpg under C:\Windows.

If you suffer from this same issue, and Personalization or regedit hacks never worked, seek and destroy that LockScreen_Z folder. I hope that helps.