Hi,
If your graphic card is Intel, try to install driver Intel Driver Update Utility. It will recognize all Intel based hardware and will offer you software drivers for it.
http://www.intel.com/p/en_US/support/detect
But if your laptop is V5-471g, then you have Nvidia you can find driver here:
http://www.nvidia.com/Download/index.aspx?lang=en-us
Also you can use Hardware Vendor Detection Utility:
http://acer.custhelp.com/app/answers/detail/a_id/14387/~/hardware-vendor-detection-utility
Regards.