every time i open up my photoshop cs4, it displays this message: "photoshop has encountered a problem with the display driver, and has temporarily disabled GPU enhancements. check the video card manufacturer's website for the latest software. GPU enhancements can be enabled in the Performance panel of Preferences."

if you check out the adobe website they have a FAQ page about these exact problems.... It's probably because your gfx card is simply unable to handle the requirements of the program.

no , cs4 works though, but it just appears that message every time, so i don't know which options can not be used ..