Hi there! Because the forum you originally posted in is for beginners trying to learn the basics of Photoshop, I moved your question to the Photoshop General Discussion forum, where you'll get more specialized help.
To help others help you, please read through this article and provide any additional relevant details.
Welcome to the forum.
Just for clarification, did you download and install the video driver from the mfgr's. Web site, such as nVidia, or AMD/ATI?
The reason that I ask that, is because too often, people will let their OS tell them, if they have the latest driver. That info is usually at least 6 mos. out of date - always go to the "source," plug in your card/chip and your OS, and if there is a newer driver, download and install that.
Note: there have been a few threads on problems with newer AMD/ATI drivers, so if you have one of their cards/chips, you might want to check out some of the threads on those.