Other users chimed in and reported similar issues with Avira. German publisher Heise suggests that the Friday update for Avira products has caused the issue on Windows. The issue affects Windows 10 and Windows 11 according to Heise's report. For some users, windows PCs are usable for about two to three minutes before they lock up completely and can't be used anymore. Other users mention freezes during startup so that they can't log on at all on the system.