Firstly, welcome to PC Help Forum, Sarah.
Not being a Norton user I can't check it "live" for you - but the official instructions are as follows;
1 Right-click the Auto-Protect icon, which is located by the clock in the Windows system tray.
2 Click Disable.
For Norton AntiVirus 2005, in the Options popup window that appears, select the period for which you want Auto-Protect turned off, and then click OK.
A red circle with a slash through its center appears, which indicates that Auto-Protect is disabled.