Avira antivirus causes Windows computers to freeze after bootSince Friday, Windows users have reported problems with the operating system freezing shortly after booting, an issue linked to a faulty update for Avira's security software. [...]
Source: Avira antivirus causes Windows computers to freeze after boot (https://www.bleepingcomputer.com/news/technology/avira-antivirus-causes-windows-computers-to-freeze-after-boot/)