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Error code 643 when installing Windows updates

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Hi,

I was wondering if anyone could help me with this problem? My laptop has Windows 7 operating system and I've been getting a constant problem when installing updates. Some updates install, but with all the others I get the 643 code and it says Windows has encountered an unknown error.

Am hoping this is something straightforward enough to fix as I'm not very computer literate! Any advice would be very much appreciated.

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