Screensaver:

1) Right-click the desktop and select personalize

2) Choose the screen saver button

3) Choose a screensaver from the screen saver drop down list.

4) Click the preview button to preview your screen saver of choice. ...

5) Click to stop the preview, click ok, and then click the Close button.


Autolock:

Under same window as screensaver, select box that says "on resume, display login screen."