IMHO, free antiviruses are sufficient to protect you, without needing to shell out money just for the "better" protection offer by paid counterparts.

In fact, if you're knowledgeable when it comes to avoiding suspicious downloads/ sites, you will hardly or never encounter any PC infections.

There's Comodo Internet Security, Microsoft Essentials, IOBit Malware Fighter if you're looking for security suites which are freeware.