Some users reported that Windows would not start at all anymore and several other issues such as that the Microsoft Management Console would ask for admin credentials while logged in as an admin or that the installation of Microsoft Security Essentials failed.The update that caused the issue this time is KB3004394.Look to the other tools, like the Submit Feedback button in the client, for that.As always, please follow the Universal Rules and keep content focused on appropriate topics for this board.

1- Delete your **<install path>\RADS\solutions\league_client_sln** folder if one exists in your League install 2- Delete **all but your "installer" folder** in **<install path>\RADS\projects\league_client\releases** directory 3- Run **<install path>\RADS\projects\league_client\releases\installer\deploy\League Client.exe** 4- A progress window should pop up.

But as soon as I switched to x86 edition manually installed latest "Windows Update Client for Windows 7" it all works.

To be able to install the update you first need to install the April 2015 servicing stack update for Windows 7 and Windows Server 2008 R2 update (again, stop WU service before trying to install the MSU).

Download (April 2015 servicing stack update): For the record, here are the steps that fix my problem (32-bit Windows7 SR1) that stuck at "Checking for updates" or "Preparing to install".

(1) run "net stop wuauserv" from to stop Windows Update service; (2) download and install "April 2015 servicing stack update" (Windows6.1-KB3020369-x86.msu") mentioned in this answer; (3) download and install "Windows 7 SP1 Update Rollup" (Windows6.1-KB3179573-x86.msu); (4) download and install the "Windows Update Client Update" (Windows6.1-KB3172605-x86.msu) mentioned in this answer.