Not only did I have to nearly completely cripple the software, turning off just about everything except for the Norton Antivirus part of the suite, every time I shut down my system would hang because of this pile of garbage.
I eventually got sick enough of it that I hunted down the answer. Do yourself a favor and stay away from this piece of junk; I'd always liked Norton in the past, but not after the amount of time I had to spend just to get my machine working properly. The fix...
Turn off Auto-Protect floppy drive scan on shutdown
Norton Auto-Protect is configured by default to scan floppy drives when the computer shuts down. This message can happen on computers that do not have floppy drives. If your computer does not have a floppy drive, follow these steps to turn off that option.To turn off floppy drive scanning on shutdown
Start Norton AntiVirus. If Norton AntiVirus is installed as a part of Norton SystemWorks or Norton Internet Security, then start that program.
Click Options. If you see a menu, click Norton AntiVirus.
In the Norton AntiVirus Options dialog box, in the left pane, double-click Auto-Protect.
In the right pane, uncheck Scan floppy disk in A: for boot viruses when shutting down.
Shut down the computer.