Update (thanks grawity): From MS, What are UAC settings? Because the UAC dialog box isn't on the secure desktop with this setting, other programs might be able to interfere with the visual appearance of the dialog box. This is a small security risk if you already have a malicious program running on your computer.
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
At this point Secure Desktop should be disabled.
Windows Vista Home Users
You will need to open up
regedit via the start menu search box. Browse down to this registry key:
Right-click in the right-hand pane and create a new
32-bit DWORD value called
PromptOnSecureDesktop, setting the value to
Downloadable Registry Tweak
Just download, extract, and double-click on the DisableSecureDesktop.reg file to enter the information into the registry. There’s also an included EnableSecureDesktop.reg file to put things back to the way they were.
Download DisableSecureDesktop Registry Hack