I use a paid for virus program on my home computer,, but my neighbor who is on limited income, had no virus protection on her PC so I install the
AVG \Grisoft 7 free version, ( which I have heard is very good free program)., and because it is free there is no support for them,, so I wanted to pass along this email I received from her. Maybe I missed something on her XP pro windows with Microsoft firewall and updates installed and turned on., I thought had selected the program properly to update at a certain time each day but received this email from her.:

There seems to be a problem with my anti-virus protection. I turned on the computer just before 4 p.m. yesterday since my anti-virus protection is supposed to kick in automatically between 4 and 6 p.m. It did not kick in so I manually activated it at 4:30 p.m. Tonight I turned on the computer again shortly before 4 p.m. but it never did kick in so I manually activated it after 6 p.m.
Why does it not kick it at 4 pm. and how can I fix it?