Follow these steps
1
Open Windows Security from the Start menu.
2
Under Virus & threat protection, confirm Real-time protection is On.
3
Run a Quick scan, then schedule a full scan when the PC is not in use.
4
Open Firewall & network protection and ensure the active network firewall is On.
5
Do not disable firewall prompts unless you recognise and trust the app.
6
Keep Windows and browsers updated to receive security fixes.