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Every since User Account Control (UAC) hit the streets people have been complaining about how it darkens the screen out when asking for permission to do something. Personally I didn’t find it that annoying, but a lot of people have been complaining about it. You can change this default behavoir. Go to the start menu and type in security in the 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 the item, and change it to disabled and then click OK.

Note: This does make your system slightly less secure, so be warned.

For Windows Home users, you will need to open up regedit via the start menu search box. Browse down to this registry key:

[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System]

You should see a key called PromptOnSecureDesktop. Double-click this and change the value to 0.

Source: HowToGeek. Check out some other great posts from the same site!