Popular security firm, BitDefender did a small test on Microsoft’s newly launched OS – Windows 8 and found that Window 8 is prone to infection by some 15 per cent of the 100 malware families most used by cyber criminals this year, even with Windows Defender activated.

The test showed that Windows 8 was infected by 61 malware threats of 385 of the most popular malware samples in a controlled test carried by leading virus researchers over the past week.

Catalin Cosoi, Bitdefender Chief Security Strategist said:

“As a means of protecting a computer from viruses, data theft and other type of malware, Windows Defender is better than nothing,”

“But it’s not a whole lot better. Most of the popular antivirus can do better. The conclusion is clear: Using your PC without a security solution is extremely risky.”

Of the 385 malicious samples, 234 ran successfully when tested without Windows Defender activated. Our of the remaining 138 samples could not be started on the machine for various reasons, six threats executed but then crashed, and seven others launched but had their payload blocked by UAC.

Alexandru Balan, Bitdefender Chief Security Researcher said:

“Even if the new operating system boasts a major overhaul in terms of visuals with the introduction of the Advanced UI, Windows 8 with the default antivirus solution activated registers alarming detections rates similar to the one registered by Windows 7,”