New Computer Won't Accept Password...Help? (See below).

I got a new computer and did all the set-up. I am the only user. It asked me for a password to use to lock the computer when it closes/shuts down/hibernates. I chose a password, entered it, came up with password hints…even typed and re-typed it as I thought of a secure one. I am sure of the password, basically.

I shut it down to go run an errand…came back and it says “wrong
password”. I have checked caps, everything. No deal. It is telling me it is wrong. I know it is not. I have done this set-up before
on other computers—no problems. I typed it in carefully and it is still saying it’s not right.

I had problems with my other computer, hence this new one.l am having to run the old one on an ethernet cable and was running it
as I configured the new one. Would that have interfered? I was doing that because my old one was refusing to recognize the wireless and I needed it until I set up the new one. I am typing on the old (ethernet) connected one. The new one was picking up wireless fine.

I promise I checked and re-checked the passwords…now I am locked out of my computer…completely. It says that the to only way to set up a new password is to use a floppy or a USB…I have no idea what either one is.

I am not locked out of my account…I am locked out of even getting into Windows…if you know of a simple way for me to get in, will you please let me know?

I appreciate your help.