I hope you deactivated the old copy before you disposed of computer. Otherwise they have an activated copy of your program without legally transfering it.
Assuming you deactivated old copy just install new copy from install disks.
I didn't deactivate it from the old one actually. i was assuming that as it was bought on line, i could transfer the licenses.
i don't have install discs
You may be out of luck unless you have serial number, or can get the s/n from your Adobe Account, and can get the program deactivated by new user. They have to open PS and click on Help/Deactivate. Not possible to transfer licence as it is licenced to you not the machine.