Photoshop CS4 says OpenGL is unavailable

Sep 27, 2010
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Hope this is the right forum for my query.
I've been using Photoshop CS4 for a number of years (still using Win XP SP3) with OpenGL activated under Edit>Preferences>Performance. I recently uninstalled some software I hadn't used for a long while to make start-up and shut down somewhat faster, and I accidentally uninstalled Photoshop.......I know, but I like Malibu and pineapple. Anyway, I re-installed Photoshop CS4 but guess what? Photoshop is now telling me that Open GL is unavailable and the tick box is greyed out. Photoshop is now so slow, especially when undertaking certain actions and moving items on the screen. The on-board graphics driver hasn't changed. Anyone know what's happened and how to rectify the problem please?

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