Just bought a computer with a ga-78lmt-s2, but it came without the ethernet (wireless driver).
Is it compabitle with windows 10 or i’m just not findind the right driver? Because i can’t do anything without internet. Pleeease help me!
You can use the installer of the CD, it should install the Win8 version and work fine on Win10.
Just took a look on Gigabyte site and it seem that this board only have an ethernet (not wi-fi) on-board card.
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It didn’t come up with a cd, unfortunately, and i tried 8.1’s version. Didn’t work at all. 
Try this out: http://www.realtek.com.tw/downloads/downloadsView.aspx?Langid=1&PNid=13&PFid=5&Level=5&Conn=4&DownTypeID=3&GetDown=false
Click the “Global” link next to RTL8111DP/EP DASH All-In-One installation kit for Win7/Win8/Win8.1, and if that doesn’t work, try the Win10 Auto Installation Program (SID:1864115) download.
Those are the links for the ethernet driver, but as Nirimetus said, that board does not have onboard wi-fi.
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I found it, some point ago.
I was missing the wireless USB antenna. I thought that it was built in, since it’s an expensive motherboard. Oh well, problem solved.