Change of http settings has made my hotmail inaccessible from any pc . I can't change them back...?

i was using a dodgy pc in the break room where I work to chekc my hotmail. Hotmail prompted me tochange to https which I did. Now, I cannot access my account from any pc. it tells me the prob is with the http settings after I log in but there appears to be no link or way ro change bakc. It's a very important account and I need to get access. PLEASE HELP!!!