no internet in xfce 4.8

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http://askubuntu.com – Last night the internet just stop working. It says in my laptop that the wireless is on and all other laptop at home are working, but mine isn't. when I try to see the problem in the proxy setting as chromium told me to check it says: "when running chromium under a supported desktop environment, the system proxy setting will be used. however, either your system is not supported or there was a problem launching your sysyem configuration. but you can still configure via the command line. please see "man chromium-browser" for more information in flags and environment variables." I've tried googl (HowTos)