Can't install because I don't know password required for installation of Acrobat. I have an adobe.com password but that doesn't work. What password do I need to install Acrobat?

How can I find the password so that I may install  Acrobat?  I know my Adobe.com password but that doesn't work.  My personal computer password does not work either.  What password is needed?

Thanks  for your  help!