In an effort to polish up its tarnished security reputation, Microsoft last week announced new features for the next version of its Windows operating system that will help prevent naive e-mail users from unleashing viruses on their computers.

As part of its “Secure Windows Initiative,” the software giant also is beefing up internal and external testing of its software, and it plans to have an outside firm validate its .Net Web-based services software for security. Microsoft also has purchased technology from an outside company that is intended to help it cut down on the amount of buggy software it releases.