: Common signs of infection include your browser (like Firefox or Chrome) opening Command Prompt (CMD) windows unexpectedly or having unauthorized text added to the "Target" field of your browser shortcuts.
: Use tools like Microsoft Defender Offline Scan or HitmanPro while in Safe Mode to detect and remove threats that may hide while the OS is running normally. Indicators of Malicious Intent
After update, RAR and ZIP files fail to download - Google Help