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There have been 8 different patches to WU in the Win7 cycle that I know of: I assume that most of vairiation is due to varying hardware and driver combinations. But steps 2 and 3, in my testing, always take 30-90 minutes, and I have had reports of them taking as much as 7 full days! That's the high outlier most people report that it takes from 1-6 hours. It has nothing to do with your network speed or the availability of Micrtosoft's WU servers step 1 almost always completes speedily.
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Steps 2 and 3 of the above process are where the bug is. It will grind and grind for 30-90 minutes (in my test lab), and return a list of over 190 patches that it would like to install.
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So let's install Windows 7 Pro, from clean SP1 media, into a VM on Hyper-V (so thus having no non-MS drivers or other software to update).
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The cab contains more cabfiles, also crypto-signed. This signature is checked, and the cab is extracted.