Excuse me Gents, I'm both new to this forum & a silver surfer, also not a great deal of PC knowledge.
I think that I have this same MB BIOS Z68AP-D3 F3 & also had the same problem (Maybe) I had the PC from OCUK however I used my own Windows OS after the install of OS & MB drivers etc I was surfing the net fine, once I'd installed every update which included I think it was called the Realtek something or other, after which I couldn't get on the Internet at all. I knew it must have been some problem related to the update I also knew this Realtek Gizmo had been updated. I solved this through uninstalling networking adapters in Device manager & rebooting the PC after which I installed the missing driver from the Gigabyte CD & made sure I didn't allow any further Realtek update to this device.
Like I say, I'm an oldie with very little PC knowledge, so in advance if my response is incorrect then very I'm sorry.