Make User Account Control (UAC) Stop Blacking Out the Screen in Windows 7 or Vista
In Windows 7 or Vista, the screen goes dark when the User Account Control window comes up, which is extremely annoying. They call it the “Secure Desktop”
Note that this will make your system less secure before proceeding.
Windows 7 Makes it Easy
If you are running Windows 7, you can simply head into the UAC settings in Control Panel (or type UAC into the search box), and drag the slider down until you see “Do not dim the desktop”.
Windows Vista Business/Ultimate Users
To get to the configuration screen for this, type in security to the start menu search box. You should see the Local Security Policy as the top search item.
In the Local Security Policy window, browse down to Local Policies \ Security Options
Over in the right hand part of the window, scroll down near the bottom and find the item titled “User Account Control: Switch to the secure desktop when prompting for elevation”. Double-click on it to open it up, then change it to disabled:
At this point Secure Desktop should be disabled.