Nvidia network connection and internet disrupted

[chess51]

Hello,
I tried avast yesterday after using avg. When rebooting it had the message aavm error rpc and pointed to a trojan which was my firewall (look and stop) and stopped my connection to the internet (cable not connected since I have broadband).
I uninstalled avg and told avast to skip the file in which the firewall is located ; then rebooted.
Avast started working properly , however there was no way I could reconnect to the internet ; the nvidia network controller was disconnected as well as the cable. I tried to reinstall the driver without success.
I have a windows xp , a gigabyte board with amd 64.
Any hints?
Thank you.

[riskpusher4life]

what are the firewall/s you use?

[Lisandro]

I tried avast yesterday after using avg.
I uninstalled avg...

Did you uninstall AVG or just disable it? Disable was never enough 
AAVM (RPC) errors are related to two active antivirus in the same computer.

however there was no way I could reconnect to the internet

Which firewall do you use?

[DavidR]

chess51, gave his firewall, Look & Stop.

When rebooting it had the message aavm error rpc and pointed to a trojan which was my firewall (look and stop)

uninstalled avg and told avast to skip the file in which the firewall is located ; then rebooted.
Avast started working properly , however there was no way I could reconnect to the internet ;

Lost Internet Connection - To recover you internet connection, try downloading and running WinsockXPfix: http://www.snapfiles.com/get/winsockxpfix.html

If you have, XP SP2, try Windows Start button, Run - type 'netsh winsock reset' without the quotes - this may be enough to fix the issue.