HT1338 connection to internet ok but cannot view webpages in browser

I have a MacBook that has always been able to connect to the internet and view webpages aok until this afternoon. Although it is connected to the Internet ok, it will not let me view any webpages in either Safari or Firefox. The page justs spins and spins and never loads. I've tried a few different websites and have also tried via both our wireless connection and hardline connection to no success.
I am able to connect to the internet and view webapges ok on a different computer on the same network so I believe this problem is limited to my MacBook.
I've done some research and understand that maybe something called 'mDNSResponder' could be the problem? Something about problems resolving the hosts via DNS? I've seen some suggestions on how to fix this but I am wary of just doing a bunch of stuff that someone posted online - especially when it involves commands with the word 'kill' in it. And I'm not understanding where I am supposed to type those commands anyway - in Terminal?
Any suggestions?
Thanks in advance.

Hello Ruth,
Make a New Location, Using network locations in Mac OS X ...
http://support.apple.com/kb/HT2712
Is that Interface dragged to the top of Network>Show:>Network Port Configurations and checked ON?
The Interface that connects to the Internet, needs to be drug to the top of System Preferences>Network>Show:>Network Port Configurations and checked ON.
10.5.x/10.6.x/10.7.x instructions...
System Preferences>Network, click on the little gear at the bottom next to the + & - icons, (unlock lock first if locked), choose Set Service Order.
The interface that connects to the Internet should be dragged to the top of the list.
Then... Try putting these numbers in Network>TCP/IP>DNS Servers, for the Interface you connect with...
208.67.222.222
208.67.220.220
Then Apply. For 10.5/10.6/10.7 Network, highlight Interface>Advanced button>DNS tab>little + icon.
DNS Servers are a bit like Phone books where you look up a name and it gives you the phone number, in our case, you put in apple.com and it comes back with 17.149.160.49 behind the scenes.
These Servers have been patched to guard against DNS poisoning, and are faster/more reliable than most ISP's DNS Servers.

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Le 2014-11-15 à 15:45, kglad <[email protected]> a écrit :
I downloaded adobe digital editions but I cannot authorised my computer, they say I should connect to internet first but I am connected????
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