Please try these steps after creating a System Restore point:
1. Press Windows + R keys.
2. Type regedit, click OK.
3. Go to HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\NlaSvc\Parameters\Internet.
4. Make sure following values exist in right pane of Internet:
“ActiveDnsProbeContent”=”8.8.4.4”
“ActiveDnsProbeContentV6″=”2001:4860:4860::8844”
“ActiveDnsProbeHost”=”dns.google”
“ActiveDnsProbeHostV6″=”dns.google”
“ActiveWebProbeHostV6″=”www.msftconnecttest.com“
“EnableActiveProbing”=”1”
5. Restart your Computer or disable/enable your connection and reboot your router.