Microsoft’s Windows Live OneCare came in dead last out of a group of 17 anti-virus programs tested against hundreds of thousands of worms, viruses, Trojan horses and other malware, an Austrian anti-virus researcher reported yesterday. The AV Comparatives Web site, which is maintained by Andreas Cleminti from Innsbruck, Austria, posts quarterly results of tests that pit the top anti-virus products against a dynamic list of nearly half a million individual pieces of malware.

Top dog, according to Cleminti’s tests, was G Data Security’s AntiVirusKit (AVK), which nailed 99.5% of the malicious code. Not far behind were AEC’s TrustPort AV WS, at 99.4%, Avira’s AntiVir PE Premium, at 98.9%, MicroWorld’s eScan Anti-Virus, at 97.9%, F-Secure’s Anti-Virus, at 97.9%, and Kaspersky Labs’ AV, which stopped 97.9% of the malware.

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