not able to access admin page of WP

[BYakimenko]

Hi. I am really hoping you can help me. I did try searching for an answer but unfortunately I'm not able to find it. I had installed WordPress a couple of years ago and was working on a webpage without any problems. Last year I had to upgrade my OS on my Mac and as a result couldn't access WP. I reinstalled Xampp and downloaded WP but still cannot get into the admin webpage in order to revise the webpage that I am working on. I don't know if I even have the correct path and I am completely at a loss and wonder if I have to start all over again.