I have installed Windows 8 pro, installed all updates available, then activated using KMS. ##THE PROBLEM: - Whenever I try to launch any program that requires to be run as administrator, I get an error message, like the ones attached, stating the path to the program's .exe and "unspecified error". - When right-clicking the .exe or shortcut and choosing "Run as administrator", it runs properly. ## Some Notes: - On a freshly installed Win 8, i.e. without updates installed or activation, the expected behavior of a dimmed screen with a pop-up asking you to launch the program as administrator, aka the UAC window, appears normally. - I tried reinstalling twice with the same outcome. - The UAC settings are set to Windows' default "Notify me only when applications try to make changes to my computer". Also tried to turn UAC off by setting it to "Never notify me", but the problem persists. - Whatever thing responsible for this behavior starts in a delayed mode; as when trying to launch the task manager for instance by right-clicking the taskbar before the desktop is fully loaded, it launches without the described error. Trying to disable all the delayed start services; namely Software protection, Security Center, and Windows Search didn't solve the problem. Any help?