No wireless device available

I bought it in 2014 janaury. but sudenly today my pc says that ' we cud not find wireless device in this pc'. i can only surf net by ethernet.
when i went into Device Manager, then Network adapter, i click on network adapters. but i could not find wireless driver.
what should i do? please reply fast

Make sure all Vista and Win 7 computers have IPv6 disable under the LAN setting properties for each adapter.
WRT110 should have firmware version 1.0.04 or .05.  In the router disable UPnP.  Wireless settings Beacon Interval 75, RTS and Fragmentation threshold 2304, channel 1, 6 or 11.

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