UAC is not asking for credentials for installers

I have observed that normally UAC elevation applications do not display it. Then, the request fails with an error due to insufficient privileges or access denied.

For example, in a perfect system of working Windows 7 if I download an installer, Windows shows the standard UAC calls requesting permission to execute high privilege. However, on my system, tweaks has become screwed upward, and the prompt does not appear. In addition, it seems 'decline auto' demand, and then the application will fail with a permission error. But if I raise the application manually, by clicking on the right, and selecting "run as administrator... "it works very well. In a correctly configured system, I don't have to do this-the application itself.

Doing things that require a UAC elevation, as open some MMC, work very well. The problem mainly affects applications designed for auto-élever when they run everything first, as installers.

I tried to move the installation program downloaded to a different folder than the folder downloads, without success. He never asks me to rise.

Some programs simply does nothing, for example if I download Teamviewer Installer and the double clik, nothing happens. However if I right click and select run as administrator it works perfectly. Other programs just says access denied if I manually run them as administrator.

I configured all default security strategies, as it is displayed in this page, but the behavior is the same.

I had this problem in three different machines. I think it might be related with:

  • Disable UAC and then turn it back on.
  • Using a secondary hard drive for Documents, downloads, etc.

After much research I found that the problem is in the permissions of the folder %TEMP%.

User name\AppData\Local\Temp C:\Users\

After giving total control to the user name , everything works as in a normal machine, but I don't know what are the default permissions for this folder. I'll check in a new installation.

Edit: After checking permisions of the % TEMP % folder in a new installation, I saw that the permision are:

  • SYSTEM: Full control
  • CURRENTUSER: full control
  • Administrators: Full control

But the important thing is that these permissions are not set in the folder %TEMP%, they inherit the main user of c:\users\username folder

So now I set permission to inherit, and it works in my three computers.

Once the audit this folder on one computer, I realized that Adobe Acrobat 11 software is changing permissions of this folder, the origin of the problem "UAC does not quickly." The three affected computer has this software installed. I'm not certain about it, because I have not done a deep investigation, it could be % TEMP % permissions have been changed by some other cause, but it looks like a Acrobat.

Tags: Windows

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