Desktop password

Hello,

I have Windows XP Professional on my desktop in my home office that I haven't used in literally YEARS, because I just use my smartphone. I can't remember the password and the screen shots that are listed here must ONLY be for Windows XP Home.
HELP ME, I can't change Internet service providers without the freekin login password. This is so frustrating.
I would appreciate help from someone...please

Thanks,
Tim
If you need my cell number, just ask.