Disable AVG Antivirus and other services.

These written down from version 8.5 (free version).

To turn off the Resident Shield

Double click the program icon in the bottom-right hand corner
Click on "Tools" in the file menu and select "Advanced Settings" from the drop-down bar.
In the window that opens, click to select the "Resident Shield" option.
On the right hand side under the "Resident Shield Settings" title, be sure "Enable Resident Shield" is unchecked.
Click "Apply".

To turn off Email Scanning

In the same Advanced Settings window click to select "Email Scanner" on the left side.
Under the Email Scanning heading to the right, uncheck "Check incoming email".
To the right of that be sure "Check outoing email" is also unchecked. It's unchecked by default at installation.
Click "Apply".

To turn off Link Scanning

Again in the same Advanced Settings window click to select "Link Scanning" on the left side.
On the right side under the heading "LinkScanner Settings", uncheck "Enable AVG Search-Shield (need web browser restart)"
Also uncheck "Enable AVG Active Surf-Shield"
Click "Apply"
Click "OK" to close the Advanced Settings window

How to determine AVG version

Open the main program window.
Click "Help" in the toolbar. Click "About AVG".
In the window that opens titled "Information", it's just to the right of AVG version.
Click the "Close" button.

For Norton 360 Version 3.0.0.135

Turn off Norton 360 Antivirus

Open the program
Click "Settings" in top nav
Click "Antivirus" under "Detailed Settings"
Click the pill looking button next to AutoProtect until it says "Off" right next to the button.
Norton Antivirus is now disabled.

If you're troubleshooting you may want to also....

Turn off Norton 360 Firewall

Open the program (if not already open)
Click "Settings" in top nav
Click "Firewall" under "Detailed Settings"
Click the pill looking button next to "Smart Firewall" until it says "Off" to the right next to the button.
The firewall is now turned off.