Thanks to informations found here, I removed telemetry and W10 related KBs from my W7 computer. However, Windows Update got broken in the process : it now fails to download any further updates and puts a 100% load on the CPU. The Windows Update Troubleshooter (kb2714434) cannot fix it and insistently reports a 0x80070057 error. Various Microsoft "fixit" scripts related to that error failed to solve it too (kb929833; kb947821; kb968003; kb949104; kb2700567). Sorry for not providing links to these KB but the editor of the forum prevents me to do so. What should be my next steps ? Fix Windows Update in order to keep my computer in the mainstream ? That's what I would prefer to do. What is the right place in the forum to ask for support on that issue ? Resign from using Windows Update altogether and start to install manually the next updates ? Is it realistic ? How to check Microsoft repositories for new updates ? Thanks for any guidance.