Open windows Control Panel. open Personalize, click the Screen Saver link in the bottom right and in the following window adjust the 'Wait' time to a more acceptable figure and remove the tick from the box next to 'On resume, display log-on screen'. Click Apply and then Ok to save the change.
Again, open windows Control Panel and open Power Options. Click on Change plan settings next to your selected power plan and in the following window, click on Change advanced power settings. In the Advanced settings window, click on Change settings that are currently unavailable and then expand 'Require a password on wakeup'. Click the entry and select 'No' in the dropdown box.