In flaw in Macrovision's popular PC game copy protection software SafeDisc could allow attackers to gain control of PCs running Windows XP or Windows Server 2003, Microsoft warns. In a security advisory posted on its website, the software giant explains that the problem lies with the SafeDisc secdrv.sys system driver, and it says it is aware of "limited attacks" that attempt to use the vulnerability. Windows Vista users would seem to be in the clear, however—Microsoft reports that its latest operating system isn't affected by the security flaw. Microsoft recommends that users install an update released by Macrovision to help protect against the vulnerability. Installing the fix involves downloading and extracting a ZIP file containing new secdrv.sys and secdrv.inf files, right-clicking the secdrv.inf file, and clicking "Install." (thanks TechReport)