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It is important for you to be able to identify whether or not you have the SP1 already installed, or successfully installed after your attempt to install. Press the Windows Key + R and type cmd.exe to get to a command shell. Type the command "winver" and press enter. It is important for you to be able to identify whether or not you have the SP1 already installed, or successfully installed after your attempt to install. Press the '''Windows Key + R''' and type the command "'''winver'''" and press enter. See: [https://support.microsoft.com/en-us/kb/2700601 Microsoft KB-2700601]=== TRUST_E_NOSIGNATURE(0x800b0100) ===CheckSUR.log says Unavailable Repair Files. The Component Store that contains information about Windows components has been corrupted KB2522422 https://www.microsoft.com/en-us/download/details.aspx?id=14826 http://www.microsoft.com/en-us/download/details.aspx?id=19953 Windows6.1-KB2522422-x64.msu There was a microsoft update installed that is a fix for certain Canon brand printers. (KB2522422) "Cannot print from Internet Explorer 9 using some Canon printers " Turn Windows Features on or off is blank or empty* [https://technet.microsoft.com/en-us/library/ff817622%28v=ws.10%29.aspx * [https://technet.microsoft.com/en-us/library/ff817622%28v=ws.10%29.aspx Microsoft TechNet: Windows 7 Service Pack 1] Microsoft TechNet: Windows 7 Service Pack 1]* [https://www.microsoft.com/en-us/download/confirmation.aspx?id=5842 Microsoft Downloads: Windows 7 and Windows Server 2008 R2 Service Pack 1 (KB976932)]* [https://www.microsoft.com/en-us/download/confirmation.aspx?id=5842 * [http://windows.microsoft.com/en-us/windows/windows-update-error-800b0100#1TC=windows-7 Microsoft: Windows Update error 800B0100] Microsoft Downloads: Windows 7 and Windows Server 2008 R2 Service Pack 1 (KB976932)]* [https://social.technet.microsoft.com/Forums/windows/en-US/c8d05279-92e2-4df1-8c7f-dcf8fca4a172/trustenosignature-0x800b0100-when-installing-w7-sp1-or-kb2758857?forum=w7itproinstall Microsoft TechNet: TRUST_E_NOSIGNATURE (0x800b0100) when installing W7 SP1 or KB2758857]* [http://windows.microsoft.com/en-us/windows/windows-update-error-800b0100#1TC=windows-7 * [https://support.microsoft.com/en-us/kb/929135 Microsoft: How to perform a clean boot in Windows] Microsoft: Windows Update error 800B0100]* [https://technet.microsoft.com/en-us/library/ee619779%28WS.10%29.aspx Microsoft TechNet:Advanced guidelines for diagnosing and fixing servicing corruption]* [https://social.technet.microsoft.com/Forums/windows/en-US/c8d05279-92e2-4df1-8c7f-dcf8fca4a172/trustenosignature-0x800b0100-when-installing-w7-sp1-or-kb2758857?forum=w7itproinstall * [http://www.sevenforums.com/windows-updates-activation/354279-8007370b-windows-update-encountered-unknown-error.html Windows Seven Forums: Windows 7: 8007370B Windows update encountered an unknown error] Microsoft TechNet: TRUST_E_NOSIGNATURE (0x800b0100) when installing W7 SP1 or KB2758857]* [http://blogs.technet.com/b/joscon/archive/2010/05/26/using-checksur-and-update-packages-to-fix-corruption.aspx Using CheckSUR and update packages to fix corruption] - joscon [Microsoft] 26 May 2010 6:37 AM* [https://support.microsoft.com/en-us/kb/929135 Microsoft: How to perform a clean boot in Windows]=== See Also ===* [https://technet.microsoft.com/en-us/library/ee619779%28WS.10%29.aspx Microsoft TechNet:Advanced guidelines for diagnosing and fixing servicing corruption]* [[Annoyances of Windows Vista and Windows 7]]* [http://www.sevenforums.com/windows-updates-activation/354279-8007370b-windows-update-encountered-unknown-error.html* [[Windows 7 Tips & Tricks]] Windows Seven Forums: Windows 7: 8007370B Windows update encountered an unknown error]