Having your Bitcoin in your computer can expose your private keys to key loggers and malware, the antivirus may not even detect that you have such a virus on your computer, and you can lose all your Bitcoin with Adblock and antivirus on your device, it is not the best approach to secure your bitcoin from potential thefts.

There is no maximum security like having your Bitcoin offline from the internet and to that, you need to make use of a hardware wallet to manage your private keys, you only connect the device via Bluetooth or USB when you need to access them.