Go to control panel, netwaork and sharing, change adapter settings, right click on wifi adapter, click on internet protocol version 4, properties. Make sure that both "obtain an IP address automtaically" and "obtain dns server address automatically" are both checked. Save every thing, exit and reboot.
If that doesn't improve things go back through the same and this time just Check the "use the following dns server address" and set it to 192.168.1.1
Save every thing, exit and reboot.