Windows/Screen Saver

HKEY_CURRENT_USER\Control Panel\Desktop
 ScreenSaveActive 0

Then restart your computer or log out and back in to apply the changes.

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HKEY_CURRENT_USER\SOFTWARE\Policies\Microsoft\Windows\Control Panel\Desktop
 ScreenSaveActive (REG_SZ) - 0  (was 1)
 ScreenSaveTimeOut (1800) - 9999  (was 1800)
 ScreenSaverIsSecure (REG_SZ) - 0  (was 1)

ref:

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disable_screensaver.reg :

Windows Registry Editor Version 5.00

[HKEY_CURRENT_USER\Software\Policies\Microsoft\Windows\Control Panel\Desktop]
"ScreenSaveActive"="0"
"ScreenSaverIsSecure"="0"
"ScreenSaveTimeOut"="9999"

[HKEY_CURRENT_USER\Control Panel\Desktop]
"ScreenSaveActive"="0"