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Hello gran_capricc, you must remove Ati old video driver from your computer, before installing latest driver, go to Start> Control Panel > Uninstall a program > ATI Video Driver Remove, Restart Computer, i found latest driver for your Ati radeon 9550 agp video card fully compatible with Windows Vista, Xp. Click save driver to your computer, install the driver, don't forget to restart the computer. Here is the link.
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