Findest du in deiner WindowsUpdate.log z.B. sowas in der Art ?
1768 588 Misc WARNING: WinHttp: SendRequestToServerForFileInformation MakeRequest failed. error 0x80072efd
1768 588 Misc WARNING: WinHttp: SendRequestToServerForFileInformation failed with 0x80072efd
1768 588 Misc WARNING: WinHttp: ShouldFileBeDownloaded failed with 0x80072efd