I noticed this a few weeks ago. When I start Photoshop, the computer loads for a few moments but the program itself would not load. I decided to uninstall then reinstall Photoshop. When I tried to install it again, everything seemed to work fine until the computer asks me if I would like to let Photoshop make changes to this computer. The message box disappears for a few moments but none of things from my desktop appear. Then, in a few moments, it returns to my desktop but Photoshop did not install. I have tried downloading other programs, including Pixlr Editor, GIMP, and a variety of other programs. The downloading seems to work until the message box asking me if I would like to let said program make changes and nothing seemed to have downloaded in the end. Besides this, the download speed of my computer has also decreased and my computer freezes when it finishes the download. Any help would be appreciated!!