From ESET :
Built on the award-winning ThreatSense engine, ESET NOD32 Antivirus proactively detects and disables more viruses, trojans, worms, adware, spyware, phishing, rootkits and other Internet threats than any program available. ESET NOD32 Antivirus provides: 1) Proactive Protection - multiple layers of detection protecting you from Internet threats before it is too late. 2) Precise Detection - accurately identifies known and unknown threats; it consistently wins top awards from testing labs and is recognized for having zero false positives. 3) Lightweight Design - requires less memory and CPU power, allowing your computer to run fast and have more room for games, web browsing, and emailing. 4) Fast Scanning Speeds - highly efficient program ensures fast file scanning and product updates; it runs quietly in the background.

Version 4.0.314 includes advanced archive scanning, access control for removable media (previously available only to business,) a new system inspector for rootkit detection without running a full scan, and the ability to build custom-designed rescue CDs.

What's new in this version:
Version 4.0.314 includes advanced archive scanning, access control for removable media (previously available only to business,) a new system inspector for rootkit detection without running a full scan, and the ability to build custom-designed rescue CDs.