How to solve Windows 7 Libraries folder keeps opening or popping up at startup?

Sometime you have to use Upgrade Option for your Windows 7 system to do repair.
In that case, you will encounter Windows Libraries Explorer is keep opening or popping up at startup after you did repair with Upgrade option.

To solve this error, please follow below steps,
Open registry editor and go to

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\Winlogon

Check the value of Userinit and you will notice two userinit.exe like this " C:\Windows\system32\userinit.exe,C:\Windows\SysWOW64\userinit.exe, ".

You have to delete one of that to solve the error.

You can choose which one to delete depends on your Windows 7 version, 32 bit or 64 bit.

64-bit versions = C:\Windows\system32\userinit.exe
32-bit versions = C:\Windows\SysWOW64\userinit.exe

But for the best, choose "C:\Windows\system32\userinit.exe" as default and delete "C:\Windows\SysWOW64\userinit.exe".

OK. Now your Libraries folder will not pop up at startup. Error resolved.

But take note the above steps are need to modify the registry. So that you better backup the registry before you edit. By doing this you can restore registry back if something goes wrong.