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Microsoft is worried about a PowerPoint bug that could let hackers take complete control of computers running Windows. Luckily, there is a way to prevent it: Don't open unfamiliar PowerPoint presentations. Yes, that might seem like common-sense advice for anyone who doesn't want to be bored to death, but this bug does seem especially nasty. In a blog post last week, Microsoft said that it was "aware of limited, targeted attacks" using the bug, which is hidden in PowerPoint files and gives hackers full control (depending on permissions) of systems running Windows Vista, Windows 7, Windows 8 and Windows RT. "An attacker could then install programs; view, change, or delete data; or create new accounts with full user rights," Microsoft warned. The company has issued a temporary fix while it works on a security update.