Hi,
Please check if you are able to find the latest graphics driver from Acer website.
http://www.acer.com.au/ac/en/AU/content/drivers
You may also check the Intel website.
Intel® HD Graphics Driver for Windows 7/8/8.1 32-bithttps://downloadcenter.intel.com/Detail_Desc.aspx?DwnldID=23376
Intel® HD Graphics Driver for Windows 7/8/8.1 64-bit
https://downloadcenter.intel.com/Detail_Desc.aspx?DwnldID=23377
You can also auto detect the latest graphics card drivers
http://www.intel.com/p/en_US/support/detect/graphics
Let us know if it helps.