Do you really feel secure on your password protected windows computer?

Alright I know a lot of you that have specific usernames and passwords for your computer upon starting it up.  Well I freaked myself out a few days ago because I honestly found out no ones computer is really secure even with a login protected password.  Why might you ask? well there is a method a person can do to completely remove the password I am not going to say how but it is out there.  Even if you have a bios password that doesn't mean anything.  It is quite scary that someone who has a lot of knowledge like myself can easily get around a login without any hassle at all whatsoever.  In the wrong hands it is dangerous.