Give your photos a professional finish with sharpening in Photoshop. Learn to enhance details, create contrast, and prepare your images for print, web, and social media.
You’ve told us nothing about your OS or software. And a good response can’t be given without that information.
Briefly, if you have neither a backup nor a roadmap to where everything is supposed to be installed, the option would be to uninstall the application (method depends upon which version you have) and do a clean install of it again off the original Adobe disk or Adobe download. But you may have dug yourself into a hole if you’ve moved stuff around, and neither you nor the uninstaller (if needed) knows to look for it.
Oops, sorry! I’m on Adobe Photoshop CS3, on a Mac OSX 10.4.9. I actually solved the problem, though. My PS icon was out of the folder. I moved it back, and all is well again! Thanks!