I have my VirusScan set to run a scan every Saturday at 11 a.m. For some reason, VirusScan takes it upon itself to run a scan at other times during the week. It's running one right now and I didn't tell it to. I've tried to delete the scan I have scheduled and re-enter it and nothing makes it stop running scans whenever it feels like it!
Please let us know what error message you see in security center while it stops working ?
Did you previously have any other security software installed on the PC ?
What is the version of your McAfee virus scan ?
DAT version :