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"With Microsoft launching Vista along with their Defender software to protect users from viruses and spyware, it seems therefore to be an oxymoron that they have started to putting paid changing banner advertisements for malware, on the popular MSN groups servers.

"SystemDoctor2006 has made an appearance over the past few days, coming complete with pop-up windows to trap and then cause horrific damage to the computers of unaware users -- causing them to then rush out to purchase Microsoft Defender?

SystemDoctor 2006 is described by many websites as being a "rogue antispyware/malware application installed by malware".

A Microsoft Australia spokesperson confirmed the malware vendor had slipped through its ad booking processes.

Microsoft can confirm that the ads are no longer being served by any Microsoft system.

"Microsoft apologizes for the inconvenience and is reviewing Microsoft's ad approval process to reduce the chance of an occurrence such as this happening again. To help customers protect their PCs from malware threats, Microsoft recommends customers follow our Protect your PC guidance at www.microsoft.com/protect"