Yes, but then it runs the possibility of slowing down the PC when the user wants to use it. That leads to complaints.
There are ways around this. For example, set the BIOS to start the PC at say,6am every morning, and schedule the scans for 6:15 or so. Then the computer is ready by 6:45-7 and she won't even notice that scan is going on.
Adjust the time to work with her schedule.

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I'm here, you may now make your next two wishes.

Beat Me, Whip Me, Make Me Use Windows!!

Every Piece of Electronic Equipment runs on a finite amount of smoke. The systems are normally very efficient at reclaiming the smoke and recycling it, however, should you do something to let the smoke out, your system will become useless.

SAVE THE SMOKE !!

New PC :
New: Phenom 9500 Quad 2.2, 4gb ram XP Pro 64-bit (Sata 0), XP Pro 32 bit (sata 1), 40 eide HDD (music), Pioneer Blu-Ray Burner, HP Multidisk CD-RW/DVD-Rom, 2x250 Seagate HDD's, ATI Radeon 3870, Asus M3A32-MVP Deluxe WiFi-AP

Old PC:
P4 1.5GHz, 768 Ram, hda-80Gb (80Ubuntu), DVD R/RW

I don't understand.

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I'm using avast antivirus on my laptop and i prefer that 4 your aunt too.Quite easy to update and run.

Try it!