I have AVG 2015 free edition. For the last several days I have noticed that when the scheduled scan starts, usually just after I turn on my computer, the pop up that tells me the scan has started is instantly followed by the one with the message that no threats were detected. That even comes up before the one about the scan was started at times. I just now tried to scan it after I saw this happen with the same result. Can an antivirus be compromised? I feel like my computer isn't protected even though it says it is. I know the scan has not been done. I don't know what to do about this and would like some advice please. Thanks so much!