I had Photoshop Elements and PSCS4 on my Win7 computer, as well as CS5. I uninstalled Elements and CS4. While clicking on a Tiff file in the Browser opens the file in CS5, clicking on a Jpeg leads to a message saying that the program it is associated with cannot be opened. Going to the Control Panel>Default Programs, I find that Elements is listed as the "recommended" default program for .jpg files. When I expand "Other Programs," a number of icons are displayed but not PS CS5.
When I click on Browse, I am taken to Program Files>Adobe. I drill down to Photoshop CS5 64 bits>Photoshop.exe, and click on "Open." However, after what seems to be some processing of the new information, nothing happens and the default is still Photoshop Elements.
I tried a reinstall of PSCS5, but that did not change anything.