Windows update error code 450

https://support.microsoft.com/es-ar/help/15090/windows-7-install-service-pack-1-sp1
https://support.microsoft.com/en-us/help/2509997/you-can-t-install-updates-in-windows-vista,-windows-7,-windows-server-2008,-or-windows-server-2008-r2
https://www.sevenforums.com/windows-updates-activation/281710-windows-update-error-code-490-80070490-a-3.html
https://support.microsoft.com/es-ar/help/10164/fix-windows-update-errors
Modify Registry Permissions

1. Click on the Start button and in the search box, type regedit
2. When you see regedit on the list, right-click on it and select Run as administrator.
3. In the left hand panel of regedit, you will see a list of registry keys. Navigate to the following key, right-click on it and select Permissions...:
   HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Component Based Servicing
4. Click Advanced.
5. Under the Owner tab, click Edit.
6. Click "Other Users and Groups".
7. Click Advanced.
8. Click "Find Now".
9. Scroll down and double click on Everyone.
10. Click OK.
11. Put the check in "Replace owner on subcontainers and objects", click Apply then change to the Permissions tab.
12. Under type Deny, single click on any entries and click Remove. (N.B.: There may not be any Deny entries, in which case just ignore this step. Just remove any that do exist)
13. Click Edit (now on the standard file Property window under the Security tab).
14. Click Add.
15. Click Advanced.
16. Click "Find Now".
17. Scroll down and double click on Everyone.
18. Click OK.
19. Single click on Everyone and then tick the "Full Control" box under Allow.
20. Click OK TWO times.
    Navigate to the following key: HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Component Based Servicing\Packages
    And, still in the left hand panel here, find this sub key Microsoft-Windows-IE-Troublesðooters-Package~31bf3856ad364e35ÿamd64~en-US~6.1.7600.16385
    Rename it to: Microsoft-Windows-IE-Troubleshooters-Package~31bf3856ad364e35~amd64~en-US~6.1.7600.16385

https://www.sysnative.com/forums/windows-update/13761-windows-update-error-code-490-cant-install-service-pack-1-windows-7-64-bit.html
http://www.sysnative.com/niemiro/apps/SFCFix.exe
Regback
http://www.acelogix.com/download.html