Lock out of lan proxy control (grrr)

My son used my old laptop for college and the IT dept installed windows! and on top of that they set it up on a proxy server and locked access to the settings.
When i called them for the info to reset it I was given a song and dance about how i had to bring it to them to fix it. (at a charge of course)
Bullshit I live on the other side of the country
he still needs it for work so Ill just wipe it and re-install the micro-sith curse
i wasn’t upset but they guy was really snotty about it.

Im sure i could probably break the password but I dont have time right now.