Just when you thought it was safe to turn on your computer … Microsoft and Adobe inform their users they have all sorts of security flaws and even Mac users are affected.First, Adobe: Not only do the “critical vulnerabilities” in Adobe Reader 9.1.1 and Acrobat 9.1.1 “and earlier versions” cause the applications to crash, but they also can make your computer vulnerable to an “attacker.” So this is the deal:Adobe recommends users of Adobe Reader 9 and Acrobat 9 and earlier versions update to Adobe Reader 9.1.2