To make sure that no viruses are already on your computer, scan it before installing Norton AntiVirus.
To scan for viruses
Start your computer using the Norton AntiVirus for Macintosh CD.
In the CD window, double-click Norton AntiVirus. If you have already downloaded a more recent virus definitions file than the one currently on the Norton AntiVirus for Macintosh CD, use it to scan. Press Option when you open Norton AntiVirus, then select the newer virus definitions file.
In the Norton AntiVirus main window, on the Disk View tab, select the disk to scan.
See “Start from the CD” on page 21.
Scan for viruses
Installing Norton AntiVirus for Macintosh Before installation
Click the Disk View tab if it is not in front
Select the item that you want Norton AntiVirus to scan