Move the program to a different computer?

I wasn't sure how to search for the particular question that I have... so I'm just going to ask it instead of hunt it down.  When I was really young my dad bought me a Photoshop program and I loved it so much.  Unfortunately, he doesn't want to use the computer anymore so a bunch of stuff clutters that room now and he never turns on the computer anymore.  I simply cannot access it.  I asked him if it was possible to move it to my computer because I will actually USE it... but he said I simply need to take the entire computer and move it to my room.  

Is there anyway at all to just take the program off that computer and put it onto my own computer?  (I have a feeling he also threw away or lost the CD holder that goes with it... it make me want to pull my hair out.)

If not... then instead of a question lets this be an idea... can you guys please make it possible to uninstall Photoshop then reinstall it onto a different computer.  (edit: assuming the person kept the important info to do that)