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#11
Check your board manual, I think the Intel SATA ports are the white ones on the side.
You only need one LAN driver unless you use both connections and I would recommend the Intel one for that.
You don't really need a VGA driver unless you use the built in Intell VAG on the CPU, just your nVIDIA driver.
As essenbe said use driver from Gigabyte
GIGABYTE - Motherboard - Socket 1155 - GA-Z77X-UD5H (rev. 1.0)
You should be able to uninstall the unneeded drivers through Control Panel, find the controller in the list, right click and choose Uninstall.
Memtest should be run for at least 6-7 passes for a thorough test. Also test one DIMM at a time and in different slots. If a DIMM passes in one slot and fails in another you likely have a bad board. If you have any errors, stop and go to the next test.