1. Scan your computer with an up-to-date antimalware solution.
2. Disconnect from the Internet and reboot your device.
3. Run multiple scans to ensure that no malware remains.
4. Enable the firewall on your device and any connected devices (e.g., router or modem).
5. Check the startup programs for anything unusual and consider disabling them.
6. Disable unnecessary services and close important ports.
7. Make sure all system and application patches are up to date.
8. Check scheduled tasks for any suspicious activity.
9. Consider reinstalling your operating system.