Licens problem

I'm using Adobe Photoshop Elements 13. I just reinstalled Windows 10 due to various issues including Photoshp Elements 13 that crashed. I have now installed prograammet again without problems; but when I enter my serial number, I am told that it is used two times before and that I need to deactivate the software on another computer. I can not, since it is the same computer I've used the program on. I have found a place on the Abobe website, where it says that I need to contact you with such problems. It just has not been possible for me to find a place with a phone number or chat. Is there anyone who can help me?