Control Panel > Hardware and Sound
Power Options > Choose power plan
(select plan) > Change plan settings
Click on Change advanced power settings, opens Power Options window.
(Top entry of scroll list is your plan, expand if necessary) - cascade Requires a password on wakeup > Setting: select No from drop list
Expand the following and make desired settings:
Click the Apply button.
Click the OK button.
I hope I didn't forget something...