A very secure computer

My laptop is very secure. No one can get on it, but unfortunately that includes me.
Last night, instead of going to bed like I should have, I tried to change the password on my computer. I did end up changing it, but now the computer won't accept the new password or the old password. Hopefully we will be able to fix it; it would be aweful if we couldn't. I don't want to even think of that possibility. Unfortunately this is the not the first problem I have created by trying new things with electronic devices. With the exception of Dad's camera, I think I have messed up every sort of electronic device that we have in some way or another. :P