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Get rid of Avira.
Use uMatrix, or noScript or uBlockOrigin or similar and block 3rd party scripts in browser.
Block remote content in email.
Don't download programs from dodgy sites, especially "free" versions of pay only programs.
Don't open unexpected attachments in email.
Don't check out random USB stick you found.
If Windows, turn on show file endings and learn which ones can execute (inc scripts).
Turn off scripting in MS Office before opening any 3rd party doc received.
Use alternate to Adobe PDF, don't view PDF in Browser, turn off Scripting in PDF viewer.
Don't open documents in Browser, download them.
AV programs are notorious for false positives and missing new threats. Doing all above works better. On Windows the MS Defender is less bother than any 3rd party.
Only activate AV before adding removable storage (from 3rd party) or downloading an executable, otherwise have it completely disabled.
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