I tried to use the recommended driver version from ASUS support website: V6.0.27.6 http://dlcdnet.asus.com/pub/ASUS/nb/Drivers/LAN/JMicron/LAN_JMicron_JMC251_Win7_32_Win7_64_Z60276.zip
After that, I used the latest one for Windows 7 x64 from JMicron support website: http://jmicron-pci-express-gigabit-ethernet-ada1.drivers.informer.com/
I tried to use the recommended driver version from ASUS support website: V6.0.27.6 http:// dlcdnet. asus.com/ pub/ASUS/ nb/Drivers/ LAN/JMicron/ LAN_JMicron_ JMC251_ Win7_32_ Win7_64_ Z60276. zip
After that, I used the latest one for Windows 7 x64 from JMicron support website: http:// jmicron- pci-express- gigabit- ethernet- ada1.drivers. informer. com/