networking - Troubleshooting odd Windows 7 network issue

I have a Dell Studio XPS 9100 running 64 bit Windows 7.

Yesterday, after a reboot, networking completely stopped working. The computer in question was connected by ethernet to a Linksys Wired/Wireless router which is attached to my cable modem.

The computer can obtain an IP address from DHCP, but it is unable to connect to the internet. Running Windows diagnostics suggests that I should power off the router, which I have attempted with no success.

Other relevant things that I have tried:

1. List item


2. I can ping the loopback address and the address that I get from DHCP. I cannot ping the gateway (the IP address of the router).


3. I have plugged another computer into the same ethernet cable, so it is not a cable problem.



4. I have tried other ports on the router.


5. All other machines/internet devices going through this router work fine.


6. I have attempted to clear/reset the TCP stack with "netsh int ip reset reset.log" as well as resetting winsock with netsh.


7. I attached a USB wifi card to the computer. The wifi card was detected, installed with current drivers, claimed that it was working correctly, but could not see any networks. Other devices in my home can see roughly 5 networks (mine plus neighbors).


8. Rebooting in safe mode with networking will allow the computer to connect to the internet.


9. I'm currently rebooted into a minimal configuration using msconfig.

Is there anything else I can try, other than turning on every service and application on one at a time and rebooting to try to figure out what's clobbering my network?

Answer

If you have mcafee or Norton Internet security try uninstalling and see if connectivity is restored

Disabling in my experience did not work. Required full uninstall.

Then run any windows updates then reinstall.