Can you lock USB ports with a password?

no

(Edited) But you CAN passWord protect you USB Flash Drive.

The only problem with that is that you need to download.

So if you don't like downloading then bad luck, I've been trying to do the same as I'm on a school computer.

If you don't mind downloading then just google it. I did find some sites for it that included downloads.

www.timeatlas.com/.../how_to_passWord_protect_your_usb_drive

www.nick-James.com/public/684.cfm

www.cleanersoft.com/hidefolder/free_hide_folder.htm