Windows Update - Some updates were not installed

You receive error 0x643, error code 0x80070643 or updates may be re-offered when you try to install .NET Framework updates when using Windows Update or Microsoft Updates

select the link below

https://support.microsoft.com/en-us/kb/976982?CFID=65081617&CFTOKEN=e1cb0cd432c987cc-1F3B70FC-0853-AC67-B20CA2EBB9F2A305