Adobe suite programs not rexognised and are automatically on trial after re-installing osx

For four years I was able to use my Adobe suite on my Mac without bigger problems. Last month I needed to re-install my osx and since then while opening e.g. Photoshop, I got a message from Adobe Reader and I basically used it as a trial, even though before this message has never appeared. But now the trial is over and I cannot use the programs at all. When I log in to Adobe, it doesn't give me an serial number but I do have all the Adobe suite programs on my hard drive. How can I go back to the state when I coule use them without the trial option (which now is expired so basically even though I own the programs I cannot use them). Could it be that during re-installing osx I did something to the IP address so it does not recognize my programs anymore? How can I change it back? Thank you!