After recent Windows Update series of 5/9/2015, certain Windows 8.1 64-bit security features were broken. Now at logon screen my mouse is blocked, the pointer is moving but clicks aren't processed. I can only navigate by keyboard Tab button to select a user account and login. After login there's no access to desktop or Taskbar. Only after clicking Ctrl+Alt+Del, and then Cancel to return back I can access desktop or Taskbar buttons by mouse. When I open IE11, scrolling is blocked on any webpage, and full reset of Internet Options doesn't fix it. Only after Signing Out and signing back to the account I can work normally, and IE11 works OK too.

This happens with any user account. I setup a new local account, and the same thing happen again at 1st login. It also happens on another install of Win 8.1 on the same PC (dual boot) right after reboot to finish install of the same Windows Update, and that install was clean of 3rt party programs and GPU drivers. During 5/9/2015 a number of Windows KBs were installed, and the following 5/12/2015 series of updates didn't fix that problem.

This problem happens also in Clean and Safe boot modes, with or without 3rd party or Microsoft antiviruses installed or running. I run System Maintenance, also sfc / scannow and DISM file checks & repairs, some files were fixed, now these checks show no errors. But the security issue was not fixed. Right now the only way I can work on a PC is Ctrl+Alt+Del+Sign out and sign in back to the same or different user account. At 1st sign in access to many things is blocked in any mode, including Charms Bar when moving mouse to the right corners, but it opens with keyboard shortcuts.

All these issues may be linked to Windows Explorer broken security settings. I can obviously try to reinstall or repair Windows, but after installing the same updates its likely going to happen again. Pls suggest what to search for in error logs, and how I can pinpoint and fix some files, or Registry & security settings to re-claim my PC hijacked by Windows? As you know, reinstalling Windows is not the best idea or common cure, especially if its broken by own updates, and requires reinstalling all 3rd party software to no avail, and with the same expected outcome. :) 

Any way to reset Windows security settings to defaults?

• Edited by sambul13 Wednesday, May 13, 2015 11:23 PM

Hi Karen,

Last update was like 30 packages, would you suggest to hide all?

• Edited by sambul13 Thursday, May 14, 2015 2:37 PM

No, I identified KB3022345, KB3048043, KB3048097, KB3047641, KB3047254, KB3047255, but defects are rather account security related, locking some access features. Pls suggest any developer tool that allows to delete select Windows updates, if Uninstall option isn't shown in Installed Programs, and relevant Restore Point is later hidden after next Point is auto created by the system?

• Edited by sambul13 Monday, May 18, 2015 2:14 PM

I was able to roll back on one of machines to previous state before the above optional updates were installed (they were offered as recommended), but the above symptoms remain, though some files were fixed. It was expected, since almost never using System Restore results in full reversal to the previous system state, especially when it comes to access rights and permissions, since System Restore seems to place more emphasis on preserving file copies, but not security related system settings and file & folder access permissions. Or possibly reversal of security changes by System Restore is not allowed by MS.

After that a series of recommended updates was again applied, except the above ones, but didn't fix the issue. I'll see if now uninstalling one of relevant security updates KB3045999, KB3045171, KB3045685 will fix the issue, but that would likely require reinstating previous file copies, and they aren't available anymore in the system. If uninstalling these updates also reverses system file hashes database, then running DISM and SFC after that could catch the mismatch and allow file reversal to previous copies from Windows Update.

• Edited by sambul13 Monday, May 18, 2015 2:32 PM

Hi,

KB3045999, KB3045171, KB3045685 these three updates are all in my Windows 8.1 lab machine, but it work fine. So I don't think this is the root.

And system restore would remove the Windows updates after that restore date.

If system restore cannot resolve your issue, I suspect the Windows update is not the cause.

I would like to suggest you backup all your data and refresh\reset your Windows 8.1 to fix this issue:

How to  refresh, reset, or restore your PC

http://windows.microsoft.com/en-IN/windows-8/restore-refresh-reset-pc