Microsoft is issuing a new update that fixes vulnerabilities revealed by chip-makers last week.
Security holes -- nicknamed "Spectre" and "Meltdown" -- could allow hackers to access your files.
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Microsoft's update closes that gap but it also slows down your machine.
The company says Windows 10 users shouldn't notice much of a difference.
However, more than half of Windows users run Windows 8 or below.
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