Computer immediately turns back on after "Shut Down" or holding power button, after editing registry

Question

I have 4 PCs which I'm 'setting up' ready for a client. I created a batch script to set a load of values which need setting so that I can save time by not having to do it manually. (See batch script below)

However, since running this script, I cannot shut down the computers..(well, a couple of them, not all of them). By going using Alt+F4 > Shutdown, the computer "shuts down" and then immediately turns back on again. Please note, all that happens is the screen goes blank and then 3 seconds later comes on again, as if you put it to sleep and immediately pushed a key on the keyboard. It doesn't go through the whole boot procedure.

The same happens if I hold down the power button for 5 seconds - the screen goes blank and then 3 seconds later comes on again.

If you could tell me what I might have done wrong and how I can fix it, I would be most grateful!

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REG ADD HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced /v ExtendedUIHoverTime /t REG_DWORD /d 300000 /f
REG ADD "HKEY_CURRENT_USER\Control Panel\Desktop" /v Wallpaper /t REG_SZ /d "" /f
REG ADD "HKEY_CURRENT_USER\Control Panel\Colors" /v Background /t REG_SZ /d "0 0 0" /f
REG ADD "HKEY_CURRENT_USER\Control Panel\PowerCfg" /v CurrentPowerPolicy /t REG_SZ /d 4 /f
REG ADD HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows\WindowsUpdate /f
REG ADD HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows\WindowsUpdate\AU /f
REG ADD HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows\WindowsUpdate\AU /v NoAutoUpdate /t REG_DWORD /d 1 /f
REG ADD HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\NetworkList /v DefaultMediaCost /t REG_DWORD /d 2 /f

[2:16] REG ADD HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\NetworkList /v DefaultMediaCost /t REG_DWORD /d 2 /f

I am aware that one of the lines in the batch file is erroneous - the last line is accidentally trying to set the value of the path, rather than a key...which is of course impossible. Also, you'll notice that the key path is not surrounded by quotes even though it has a space in it.