CS4 Won't work

[kittner54]

My son let one of his friends put CS4 on a third computer (I have a copy and my son has a copy), but now my son's copy won't work. The friend has now taken his copy of Photoshop CS4 off of his computer, but my son's copy still won't work.

Is there a way to fix this

 

[iDad]

No guarantees but you can always try this

 

[Steve]

My son let one of his friends put CS4 on a third computer (I have a copy and my son has a copy), but now my son's copy won't work. The friend has now taken his copy of Photoshop CS4 off of his computer, but my son's copy still won't work.

Is there a way to fix this

What do you mean "won't work"?
Do you get an error message, does it load then crash or not load at all?

What's happening?