The issue that I having is that SVCHOST.EXE is using 70-90% cpu at bootup or when windows update is running. But after some research I found out that it was happening due to a bug in microsoft update. So to solve this problem I went to Windows Update and checked if the "get microsoft update today" tab is there or not, if it is then this is not the problem, if its not, then click on 'change settings' on the left side and then in the next window scroll down and untick microsoft update and click on apply changes now, this will solve the issue of windows update only.
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