I believe my laptop keyboard is pressing either SHIFT on its own

Hello,

My brother used my laptop to print something while I was away. When I got back from school, I powered my laptop and was greeted by 2 pop-ups: 1 regarding sticky keys and another regarding filter keys. I suspect that my keyboard is pressing either SHIFT buttons on its own and now I can't log in because my password is alphanumeric. I tried entering my password numerous times, but the computer responds with "The username or password is incorrect." I've tried restarting and removing the battery as well, but to no avail. I need help ASAP because my files in my laptop is needed for me to graduate college... Will USB keyboards work? If so, is there another way to fix the problem? Thanks in advance. Any help is appreciated.