Go to the screensaver settings, change energy settings, at the left you can
decide wether to use a password for reactivation.

Christian

In addition to the screensaver password, you can set whether or not a
password is required when the computer wakes from sleep. To find the
setting: Open Control Panel to Hardware and Sound> Power Option> System
Settings.

1. Click Start - Control Panel
2. If using:
   a. For Classic View, double-click on Power Options.
   or
   b. For Control Panel Home view, click on System and Maintenance and the
click
       Power Options.
3. From the right-side Tasks list, click "Require a password on Wakeup"
4. Click Change settings that are currently unavailable.
5. Now, you can change the "Password protection on wakeup" options as desire.

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