I've decided to start a little investigation on recent AMD drivers and Windows Vista (mainly the ones that work with the Rx 300 series and newer), because those drivers won't install, giving error 31 when trying to do it on Device Manager (even with the appropiate INF modding), and I love Vista too much, to let my GPU be the only reason I can't have it installed .
The earliest drivers I found, supporting the Rx 300 series, were located on the Gigabyte website, dated from April 2015, version