I'm using MDT 2013 to deploy a Windows 8.1 Update 1 image, and I have a step 
that runs for a long time, particularly on older hardware.  Prior to the long 
step running I'm using a Powershell script to modify the following reg keys to 
disable the screen saver for the logged on user (Administrator, as that's what 
LiteTouch runs under):

Set-ItemProperty -Path "HKCU:\Control Panel\Desktop" -Name ScreenSaveActive 
-Value "0"
Set-ItemProperty -Path "HKCU:\Control Panel\Desktop" -Name ScreenSaverIsSecure 
-Value "0"
Remove-ItemProperty -Path "HKCU:\Control Panel\Desktop" -name SCRNSAVE.EXE

So, Disable Screensaver with Powershell-->TS step to reboot system-->Run Long 
Step.  I've confirmed that the registry keys are set/deleted as per above, and 
the system GUI also reports that no screensaver is set during the long step.  
Yet, when the long task sequence step runs, the screensaver engages and 
requires a password to unlock.  Any thoughts on how to prevent that or what I'm 
possibly missing?

Thanks!

--Dave

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