OK. I see. Is this perhaps the reason why it did not carry out the scanning operation yesterday at 3 p.m. as scheduled, because I was working on my computer at that time? This scheduled scan operation did not take place at all, and seemed to have been skipped. So, this is why I am asking. Thanks and regards, -----Original Message----- From: jfw-bounce@xxxxxxxxxxxxx [mailto:jfw-bounce@xxxxxxxxxxxxx] On Behalf Of heather kd5cbl Sent: 31 January 2011 12:07 To: jfw@xxxxxxxxxxxxx Subject: Re: MS Security Essentials Setting It has been a while sense I had that program but, I believe, if your computer is on and not being used by yourself, the scanning program will conduct the schedule scan. If you are writing say a paper, during the time for the scan I think it will wait. Like right now, my scanning program is scanning the computer even though I am writing a message. It is a good idea to have it checked because, if your typing or running the web, your computer may become slow with all the tasks going on at the same time. Heather