Thx for the reply, I'm experiencing slow speed internet, not sure if it's cuz the internet or the low signal from my router. So i tried many things and noticed this fail of DNS.
ill be very happy if u could help me to solve the problem, i got the Xirrus Wi-Fi Inspector and when i do "connection check" it says DNS Reachable ping 0 of 5 "fail: 100% ping loss". Windows IP Configuration Host Name . . . . . . . . . . . . : OR-PC Primary Dns Suffix . . . . . . . ...