What programs do you have - Photoshop Elements, Premiere Elements, or something else? Your "Photoshop" has been posted in the Adobe Premiere Elements Forum (video editing).
And, what version of the program do you have? What computer operating system is involved?
If you have Photoshop Elements 12, 13, 14, then in the Editor open session, Help Menu/Sign Out
If you have Premiere Elements 12, 13, 14, then in the Editor opened project, Help Menu/Sign Out
If you have Photoshop Elements 11, then in the Editor open session, Help Menu/Deactivate
If you have Premiere Elements 11, then in the Editor open project, Help Menu/Deactivate
Remember, deactivation (or whatever you call it) is not the same as uninstall.
Please review, consider, and supply more information so that you can customize a reply for you.