Cannot Connect to Primary DNS Server

Is there anyone here, who has an idea on how to solve my problem about wireless connection? I am experiencing a problem with my newly bought Lenovo laptop today.
I have five Personal Computers in my computer cafe, that are sharing an internet connection through a wireless router. When I connect the Lenovo laptop into the wireless router, it does not connect. Instead, this error message appeared, “Cannot communicate with Primary DNS Server.”
I followed the available option which was to reset the wireless network connection adapter but then the similar error message had happened.
"Cannot communicate with Primary DNS Server."
I’m just wondering, why this internet connection error only occurs on my laptop, while the internet connection to my other five personal computers are fine.
Please enlighten me.
Thank you.
