student account wont authorize on new computer

Hi - 

I got a new laptop as my other one broke. I figured out on the mac how to delete authorization through finder (thank you forums). I logged onto the browser to change my password. Ebook vendor is campus ebookstore. my adobe id is my school email and i try the password i just changed but i get "incorrect login id or password  for selected ebook vendor" . i tried uninstalling and reinstalling but it wont automatcally authorize. Tech support says i need the original password i made months ago that i clearly dont remeber. I know the ebook vendor is correct as its greyed out. I have exams next week and am panicking i cant access my own account!! please help