I am working on Microsoft Windows Vista 64-bit with Service Pack 2 (SP2) on an HP Notebook PC. I am not able to install update .NET Framework 3.5 Service Pack 1 as well as .NET Framework 3.5 Family Update (KB951847) x64. Windows Update prompts a reportedly unidentified error code 643 in addition to the update fails. So please if anyone knows how to get out from this problem then please suggest me about this over here.
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