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Are you using another antivirus (AV) program on your machine besides Avast? If so, you cannot use 2 AV’s on the same machine because they can cause conflicts and problems not to mention false positives if both programs are resident (running all the time). Turning one program off or disabling it is not the same as uninstalling it.
If you just scanned your machine with another on-demand (not on all the time; in use only when you want it) scanner with Avast on your machine, is fine.
Please clarify if you actually have one AV on your machine or more then one AV and if they are resident or non-resident, and what security software you have on your machine. Thank you.