You should always have a good firewall & antivirus
Avast (has free and paid versions)
Eset Nod32 (Windows only)
Kaspersky
are all good choices
Use other software to run malware scans. (e.g malwarebytes)
Also use good internet habits. Don't leave tabs logged onto important websites while your computer is unattended.
Don't klick on untrusted links in emails and don't load software from untrusted sites.
Keep updates up to date.
Avoid holding unnecessary funds on crypto exchanges
Avoid running wallets on important computers (run it on a Raspberry pi or spare computer)
Avoid running multiple wallets on a single computer (in case one has a trojan and steals your other crypto) POS staking makes your wallet potentially a lucrative target.
Avoid using social media / Don't use social media apps
I scanned my system with bitdefender and malwarebytes and havent found any virus. Im probably lucky and have a newer version of the wallet wich is clean