The updated driver should have fixed it. Im sure you turned off the pc after you updated the driver and left it alone until today you turned it back on and it works like it should. ;)
I found these.
https://downloadcenter.intel.com/download/25242/Network-Adapter-Driver-for-Windows-7-?product=27623
https://downloadcenter.intel.com/download/18713/Network-Adapter-Driver-for-Windows-7-
Yea i saw the Google Fiber website and now I am hoping they come to my county soon..lol to answer your question, test the internet speed while directly connected to your modem and see what you get.