MY BROWSER CAN'T ACCESS TO INTERNET After running the grimefighter!!

I am so angry!!

I bought the avast grimefighter today and let it run for all the afternoon.
after it finished, my laptop start up again, I can can not access to the internet through Chrome or IE anymore,
the details in the chrome says:

Error code: DNS_PROBE_FINISHED_NO_INTERNET

SHOW me how to fix it!!!
My laptop is Windows 7 home advanced version
I have uninstalled the Avast, because it make me disappointed!!
YOU RUINED MY LAPTOP!!

GrimeFighter forum section is found here https://forum.avast.com/index.php?board=44.0