I have a strong wireless signal but cannot connect to the internet

  weemacs 17:38 22 Oct 13

I am using a Huawei E5220 MIFI and a netgear dongle. This has worked perfectly until today. The wireless signal is strong and will not conect to the internet. There is a yellow triangle with a black exclamation mark over the network on the task bar. No settings have been changed. Hope you can help. It is the only pc in the area and therefore I cannot get onto another one when there to seek help. Thanks in advance.

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