Can’t Use Internet (DNS Server Not Responding)?

For the past couple of days I can’t use the internet on my desktop but i can on my laptop. Both run 64bit windows 7 but the desktop keeps giving me “dns server is not responding”. When i open a browser i get “dns lookup failed”. I have hughesnet and i use their adobe air app “status meter” to gauge my bandwidth use to prevent being penalized. The app works on the laptop but it didnt work on the desktop even before dns problem. Please help me solve this problem :(. Thank you.