Now that your Toshiba laptop asked for your login password, perhaps somebody create a password on it. So in my eyes, you can use a Windows password recovery tool to remove or reset your password. The SmartKey Windows Password Recovery is not so bad. You can read more in http://goo.gl/YqD9iI
If your PC is running on windows 7 or windows vista, it could be the UAC (user account control) notification settings that will pop up just to ensure security is maintained in your Toshiba a505 s69803 laptop. Simply click accept option and since you have not put in any password it will disappear.