There are many threads with the same problem, here is the solution that worked for me:
1. disable updates, set it to never check
2. restart
3. install this manually: https://support.microsoft.com/en-us/kb/3102810
(direct links
32Bit: http://www.microsoft.com/downloads/details.aspx?FamilyId=fcd6bf5d-f004-4ca3-aa7e-1de462b91dd0
64Bit: http://www.microsoft.com/downloads/details.aspx?FamilyId=4fe566bd-31b1-4413-8c4c-412b52533669
4. restart
5. install updates normally now, either set to automatic check or manually check ..etc.
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the link https://support.microsoft.com/en-us/kb/3102810 says:
Installing and searching for updates is slow and high CPU usage occurs in Windows 7 and Windows Server 2008 R2
Issue 1
When you install updates by using System Center Configuration Manager, the installation takes a long time, and System Center Configuration Manager becomes overloaded.
Issue 2
The Svchost.exe process occupies 100 percent of CPU usage when you upgrade a Windows Update client to Windows 10.
1. disable updates, set it to never check
2. restart
3. install this manually: https://support.microsoft.com/en-us/kb/3102810
(direct links
32Bit: http://www.microsoft.com/downloads/details.aspx?FamilyId=fcd6bf5d-f004-4ca3-aa7e-1de462b91dd0
64Bit: http://www.microsoft.com/downloads/details.aspx?FamilyId=4fe566bd-31b1-4413-8c4c-412b52533669
4. restart
5. install updates normally now, either set to automatic check or manually check ..etc.
----
the link https://support.microsoft.com/en-us/kb/3102810 says:
Installing and searching for updates is slow and high CPU usage occurs in Windows 7 and Windows Server 2008 R2
Issue 1
When you install updates by using System Center Configuration Manager, the installation takes a long time, and System Center Configuration Manager becomes overloaded.
Issue 2
The Svchost.exe process occupies 100 percent of CPU usage when you upgrade a Windows Update client to Windows 10.
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