Acer Veriton 3700G User Manual page 77

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You can schedule customized virus scans that run unattended on
specific dates and times or at periodic intervals. If you are using the
computer when the scheduled scan begins, it runs in the background
so that you do not have to stop working.
For more information about Norton AntiVirus, including setting up
custom scans and scheduling scans, refer to the Norton AntiVirus Help
menu.