I couldn't find a graphics card driver for my HP Pavilion 513n. After extensive research I found that it uses an Intel Extreme Graphics integrated driver. This may work for other HP Pavilion 5xx series models and possibly other HP Desktops as well. Worked perfectly for my Pavilion 513n. Word of caution, upon installing the driver I had to re-register my WinXP home OS with Microsoft, so if your OS isn't legit, proceed wiht caution!
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