Need to disable the protection on the internal network

Hello Veronica, 

We are glad to help you. You do not need to disable AVG Internet Security program. You can enable Internet Sharing mode in AVG Firewall settings and check it. 

Open AVG Internet Security  - Click on Menu at the top right corner - Go to settings - Full Protection - Enhanced Firewall - check the option for Internet Sharing mode.

Please try the above steps and let us know if its help you.

It is not allowing internal computers on our network to log on to shared files

Hello Veronica, 

We are glad to help you. You do not need to disable AVG Internet Security program. You can enable Internet Sharing mode in AVG Firewall settings and check it. 

Open AVG Internet Security  - Click on Menu at the top right corner - Go to settings - Full Protection - Enhanced Firewall - check the option for Internet Sharing mode.

Please try the above steps and let us know if its help you.