Você já tentou editar o registro como mostrado na esta postagem
Os passos são os seguintes
Press Windows Key + R and put regedit in Run dialog box to open Registry Editor then Click OK.
In the left pane of Registry Editor, navigate to following registry key: HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows
Now highlight Windows key and right click, select New > Key. Name the newly created sub-key as Personalization. Highlight Personalization and come to its right pane. In the blank space, right click and select New > DWORD Value. Name the registry DWORD (REG_DWORD) so created as NoLockScreen. Double click on this DWORD to modify:
Finally, set the Value data to 1 in Edit DWORD Value box shown above. Click OK. You can now restart your machine to make this setting effective. After reboot, you’ll see the lock screen is no longer displayed.
Espero que isso ajude você!