Hi Marie and welcome to the forum. You have lost your file associations. If you are on Windows, right click any of those files and chose Open With > Chose Photoshop from the list, and click to check Always use this option (or whatever it says. If you are a Mac user, then do whatever the equivalent of the above is.
[EDIT] Have a look at this thread if you still have problems
I've tried that. But when I right click and press open to search for photoshop as the standard, nothing happens. I press the adobe icon but nothing changes. It just stays the same :/
Have you looked at the thread I linked to?
Where did this person locate this? Where do I go?
I found a key:
This key was set to the path for Photoshop CS6 when it should have been set to Photoshop CC.
In other words, in my case, it was set to:
"C:\Program Files\Adobe\Adobe Photoshop CS6 (64 Bit)\Photoshop.exe" "%1"
When I changed the CS6 to a CC, in other words, so the whole key reads:
"C:\Program Files\Adobe\Adobe Photoshop CC (64 Bit)\Photoshop.exe" "%1"