Hi,
Could you please post the model of your wifi card and the current driver version, in the mean time try switching your DNS address to Opendns or Googledns;
Go to Network and sharing centre(right click WiFi icon), clcik your card, Properties, highlight Internet Protocol Version 4, Properties, select the radio button "Use the following DNS address" and enter either Opendns or Googledns.
Open DNS: 208.67.222.222
208.67.220.220
Google DNS: 8.8.8.8
8.8.4.4
