Microsoft warns of (yet another) major Windows security flaw WASHINGTON -- Microsoft Corp. warned customers today about unusually serious security problems with its Windows software that could let hackers quietly break into their computers to steal files, delete data or eavesdrop on sensitive information. Microsoft, which learned about the flaws more than six months ago from researchers, said the only protective solution was to apply a repairing patch it offered on its Web site. It assessed the threat to computer users as "critical," its highest rating. A Microsoft security executive, Stephen Toulouse, said the flawed software was "an extremely deep...