What can I do if I can't install the language pack after Win7/Win8.1 update KB3045645

Microsoft May patch day, including the security update, including the various Win7/Win8.1/Win10 system patches as scheduled. This month's security update level is high, and each system is involved, users should hurry to install. However, there is a non-security update but you don't have to rush to install it, that is KB3045645.

This update works on UAC (User Account Control). After installation, it will increase the sensitivity of this security mechanism. Once the custom .sdb space database file is created, it will prompt. user.
Improving the security of UAC is not a bad thing, but this patch has "side effects", that is, no language packs can be installed after installation. If the user attempts to install it, the relevant settings will not be applied and the update will need to be reinstalled.
According to the information provided by Microsoft, KB3045645 will affect Win7 SP1, Win8/Win8.1, Windows RT and Windows Server 2012/Windows Server 2008 R2 SP1 and other systems. There is no mention of Windows 10 Preview.
Users who have not installed the update need to be cautious about this update, and then arrange the language settings before installing. Users who have already installed KB3045645 do not need to change any other language packs. If you need to install a language pack, please uninstall the patch before setting the language.