Linux ver.

 1. Log in with administrator (root) privileges and execute the following command from the terminal.

rpm -e f-secure-linuxsecurity（Based on RHEL distribution ）
dpkg -r f-secure-linuxsecurity（Based on Debain distribution）

2. Execute the following command from the terminal.

rm -rf /opt/f-secure /etc/opt/f-secure /var/opt/f-secure