I've been using Photoshop CS5 for maybe a year now and just recently everything stopped working. The current project I was on I couldn't draw anything with the brush, but it showed I selected the brush tool and the crosshair changed but dragging did nothing, I could select layers and go to the transform tool but as I started to lets say shrink something it would show the square getting small then just disappear and not shrink. Then I restarted the program but now I can't open anything. I go to open select the file, the open window closes it shows an hourglass cursor for 1 second then nothing happens. I can do this over and over it's not frozen but nothing works. Same thing with new file, after hitting ok, I get the hourglass cursor for 1 second then nothing happens. HELP!
Video card: AMD Radeon HD 7800
CPU: Intel Core I5-2300 CPU @ 2.8 GHz
OS: 64bit Windows 7
Trash the prefs, update your graphics driver, reinstall the program.