Macbook Pro won't connect to internet, says ISP has failed.

For months I have not been able to connect to my internet at home from my MacBook Pro. I have tried restarting the router many times. All of my other devices, as well as my roommates' devices connect to the internet. My wifi icon at the top says that it has connected but that the ISP has failed when I refer to the diagnostics. I've tried countless troubleshooting articles and none have worked so far. Any suggestions?

Im going to answer my own question. Problem Fixed! After I was on the phone for over an hour with a senior advisor we found the problem was with the download or the instilation. He had me Shut Down Computer and hold down Command and R then press power button hold this down until the recovery window pops up. Then reinstall mountain lion os system. this does not wipe out documents, photos and apps like windows does. I didnt know this since Im new to MacBooks. Hopefully this may help someone else.
PS I beleive In order to do this you need to be plugged into your router to have internet access. They had me do this. This will take about an hour but now Im up and running.

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