I encountered the same problem in Windows 8. When you try to update the graphics card driver, it says that it is already updated.
All I did for this was that I downloaded the graphics card driver supported by my system, i.e. the dell N5050 from the dell website. I installed this driver, which is supported by the built-in window of version 7: "Intel HD Graphics 3000 Driver_Vedio_Intel_W84_X00_A01_Setup-5PFY2_ZPE.exe hard drive."
You must install the graphics driver supported by your system.
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