Some antivirus program "quarantine" things they id as malware; most move it to a safe repository. However, others lock the file from access but leave it where it is. This can cause not only problems with running it, but also with updating it, leaving you with an out of date file w/o realizing it, just a guess. Also, some AV programs auto-"fix"/clean the file, removing the offending part, but leaving the rest there, so as to not make users lose data just because it's infected. That one can certainly lead to headscratchers, since you see the file there, but it doesn't work. Again, just a "most common answers" to a common sounding AV question
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