The best way to protect your PC from malware and viruses is to keep your operating system and any software you have installed up to date. Make sure you use a reputable security program with real-time protection that blocks malicious websites, scans for viruses and other threats and has a firewall that monitors incoming and outgoing network activity. Additionally, it’s important to practice safe web browsing habits by only downloading files from trusted sources, avoiding clicking on suspicious links and emails, and using a secure browser like Firefox or Chrome.