Problem

If you use Avira Antivir some times a virus warning alert will popup while playing VU. It says something about HEUR/HTML Malware.

More info: constant virus warning in VU

Solution

To fix the annoying virus warning you have to set the Heuristic detection to low in Avira.

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Open the Avira settings:

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Click the "Expert mode" box, expand "Guard", expand "Scan", select "Heuristic", select "Low detection level", then save the changes.