MSAV?

Microsoft Offers Virus-Removal Programs:

"Microsoft Corp., whose popular Windows software is a frequent target for Internet viruses, is offering a free security program to remove the most dangerous infections from computers."

Nothing like closing the barn door after the horses have run away.

"But a senior Microsoft executive confirmed the company's plans to sell its own antivirus software, which would compete against programs from McAfee, Symantec and others."

Here's a thought: Why not concentrate on fixing the shit you already sell?