SEATTLE - Microsoft plans to release a beta test of its free computer security program next week and is on track to launch a finished product in the fall.

Microsoft will can its Windows Live OneCare when the full version of its new security freebie ships.

Microsoft also maintains a database of trusted software sources, so the tool won't accidentally block items like Google's web browser toolbar, she said.

The security software will come as a free download, but it won't be part of Microsoft's Windows 7 operating system, which goes on sale in October. Bundling the two could be fodder for antitrust complaints.

"Referring to Microsoft's basic antivirus and antispyware product as an essential security solution is misleading," said Dave Cole, a senior director at Symantec.

He said PC users need the extra firewall protection, spam fighters and other features that come with subscription security programs.