Network connection stopped connecting - Win 7

[dakels]

[SOLVED] Uninstalling Avast premier fixed the network connection.

I'm trying to help a friend fix his computer and I'm pretty stumped. The machine is a windows 7 box. It stopped connecting to the network. I'm not sure why. No specific event to mention.

I'm pretty sure it's a software problem with Windows. I pulled the hard drive out and put it in a working computer and it still couldn't connect to the network. Vice versa I put another drive and OS on the computer and it was able to connect to the LAN. Also tried a new LAN card and wireless dongle. All the same results. Other computers on network and same router work fine.

IPV4 and IPV6 not connecting. It sees the network but can't get a IP address.
I'll list all the things I tried.

Flush DNS
Reinstall network drivers
Tried manual IP config
Command line Ping fails
Checked BIOs settings, looks ok.
Booted in safemode with networking, didn't work
Shutoff all firewalls
Windows repair did nothing.
Windows automatic troubleshooting recognizes that it isn't getting an IP address and can't fix it.

I read a lot about this and even a system restore didn't work for most people, or windows reinstall.

Looking for some ideas.

thanks

 

[Firetrak]

try this

create a static ip address and use googles dns servers:

8.8.8.8
8.8.4.4

 

[dave_the_nerd]

If a different HD/OS works with the current hardware, a wipe/reinstall of Windows should work too. Kinda surprised you haven't reimaged already.

Did you try rebooting the router? Even on the high end gear, I've seen DHCP servers take a nap.

 

[dakels]

tried the google DNS. Says no internet connection.
I restarted the router. Also moved to a different network and router, same problem.

I know I could reimage the machine, trying not to because of a lot of custom application setup on there that would be a pain to redo.

I can't help but think some core component is off or broken, or registry. Everything works fine and it sees the network, it just wont get an IP address for even the local network.

thanks for your help.

 

[VirtualLarry]

Do you have Anti-Virus or Anti-Malware software installed, that might install a networking driver for real-time scanning of network connections? You might want to try fully uninstalling those programs.

 

[John Connor]

Try to reset the TCP/IP stack. http://www.windows-secrets.co.uk/2013/08/repair-the-windows-87vista-tcpip-stack/

 

[dakels]

Thanks I'll try those 2 suggestions tonight. I did shut down antivirus but I didn't uninstall. I'll try that.

 

[dakels]

Do you have Anti-Virus or Anti-Malware software installed, that might install a networking driver for real-time scanning of network connections? You might want to try fully uninstalling those programs.

this did it! Something with the Avast Premier upgrade broke the internet connection.

Thanks all for your input.