GeForce driver 352.84 is the first WHQL-certified and latest recommended driver for all pre-release Windows 10 testing. It's from a new driver family. It can be obtained from NVidia downloads. Windows 10 driver chronology below.
Driver 352.84 is MS352_08-29, DriverVer = 05/10/2015, 9.18.13.5284
Driver 352.63 is MS352_45-7, DriverVer = 04/26/2015, 9.18.13.5263
Driver 349.90 is MS349_27-29, DriverVer = 03/11/2015, 9.18.13.4990
Driver 349.65 is MS349_27-21, DriverVer = 02/05/2015, 9.18.13.4965
Driver 352.84 is MS352_08-29, DriverVer = 05/10/2015, 9.18.13.5284
Driver 352.63 is MS352_45-7, DriverVer = 04/26/2015, 9.18.13.5263
Driver 349.90 is MS349_27-29, DriverVer = 03/11/2015, 9.18.13.4990
Driver 349.65 is MS349_27-21, DriverVer = 02/05/2015, 9.18.13.4965