Welcome to the Community!
What is your Operating system? What does Photoshop says on Creative cloud app, does it show Update?
Please try to find Photoshop in your computer:
MAC: From the finder window click on Go>> Applications and see if Photoshop is listed there.
Windows: Click on Start button>> All Programs and see if Photoshop is listed there.
If you couldn't find it then follow the steps mentioned in http://helpx.adobe.com/creative-cloud/kb/aam-lists-removed-apps-date.html and then install it.