You have Windows 7 x64? Can you verify that? If yes, then things change.
1) Uninstall current Intel drivers from device manager. Also check the box that says to delete the drivers from the computer as well.
2) Download this(Windows 7 x64 and not x86 that I gave you before):
http://downloadcenter.intel.com/Detail_D...Drivers%0A
3) Follow the guide below:
http://www.intel.com/support/graphics/sb/CS-029635.htm
I searched dell site and they have not updated their AMD & Intel drivers since 2010. So, only the above can help you...