|I don't think you can do that where hibernation is concerned. The whole point of hibernation is that your laptop returns to the desktop exactly as you left it.|
What you are asking about only works when your laptop wakes up from sleep mode:
Control Panel > Power Options
In the left panel, click "Require a password on wake up".
Click the radio-button next to "Require a password".
Click "Save changes".
Note: even if you haven't actually set a password on your user account, the login screen will still appear when the laptop wakes up, but there's little point in having a login screen without a password if you are the sole user.
You'll just have to remember to put your laptop to sleep in future, instead of hibernating it.
message edited by phil22