Start -> Search and type gpedit.msc, right click the gpedit results and Run As Administrator.

From windows command line you can run the below command to enable password for the screen saver. Screensaver can be configured from windows command line as well. Disable screen saver windows 10 by command line. Reg delete hkeycurrentusercontrol paneldesktop v scrnsaveexe f to set the screensaver to blank from command line. With default settings, when the battery level comes down to 20%, the built-in battery saver mode automatically gets turned on. When the battery saver is turned on, Windows 10 does several things to improve the battery life, including lowering the screen brightness. While dimming the screen is a good way to let users know that.

In the Elevated Group Policy Editor, on the Left Panel, go to User Configuration / Administrative Templates / Control Panel / Personalization / Enable Screen Saver and enable the Policy.

Once you have enabled that policy, go down and also enable Screen Saver Timeout. Note that in the Screen Saver Timeout policy there's an option to set the number of second for the timeout with the default being 900 seconds or 15 minutes.
Once you've enabled both policies and set the timeout if different from the default, exit the group policy editor.

If you now go the screen saver settings in Control Panel you will notice that the wait period will match the minutes you entered in the group policy editor but it will be grayed out preventing you from changing the value unless you go back into the group policy editor and change it there.

If desired, you can enable the screen saver option in Microsoft Windows. If a screen saver is currently enabled, you can also disable it. Select your version of Windows from the list below and follow the instructions.

Windows Vista, 7, 8, and 10

1. Press the Windows key, type screen saver, and then press Enter for the Change screen saver option.
2. Under the Screen saver section, click the down arrow on the right side of the selection box (A).
3. To enable, select a screen saver, in this case 'Bubbles.' To disable, select None.
4. One you're done, click Apply (B) and then OK (C).

You may adjust the amount of time before the screen saver activates by changing the number of minutes in the box next to Wait.

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Windows XP

1. Press Ctrl+D to minimize all open programs.
2. Right-click any empty space on the desktop.
3. Select Properties from the drop-down menu that appears.
4. Click the Screen Savertab at the top of the window.
5. Under the Screen saver section, click the down arrow on the right side of the selection box.
6. To enable, select a screen saver. To disable, select None.
7. One you're done, click Apply and then OK.

You may adjust the amount of time before the screen saver activates by changing the number of minutes in the box next to Wait.