Here is an Article I wrote about discovery and removal of leftovers from previous anti-virus products, my “when all else fails” procedure Antivirus software is the most invasive application we will ever use on our systems. Specifically here, we are addressing the upgrade of avast! 4.8 to newer avast! Pro or Business Protection. However, this situation also occurs with other antivirus vendors (Symantec, Norton, and McAfee just to tag a few.) What has really occurred here, is that there are left over pieces of previous antivirus software, and they are conflicting with the current antivirus software. And the classic symptom is...

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