ZoneAlarm Free Antivirus + Firewall competes directly against Microsoft Security Essentials and the built-in Windows firewall. PCWorld has not yet tested this product’s effectiveness, but I sat down with the software to evaluate its features. This isn’t the company’s first crack at creating an antivirus: We were impressed with the malware protection features of that product, but we were disappointed with its scan speeds and impact on PC performance. However, before you rely on it exclusively for protecting your system, you might want to wait for conclusive PCWorld test results.”]