Open Device Manager, Uninstall the Graphic Card and driver, reboot the machine, allow Windows 7 to apply the generic driver, Open Windows Updates and run. OR, open Device Manager, display adapter, update Graphics adapter. OR, Use the eMachine windows vista 64 bit drivers. Download the Windows Vista 64bit driver and Save , open Properties, change compatibility to Windows 7. Take a look at this :
http://www.howtogeek.com/howto/windows-vista/using-windows-vista-compatibility-mode/
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