New Windows Vista users had a very common question, then: Why does the UAC Prompt disable Aero, when it appears ? The answer was ofcourse, the newly introduced Secure Desktop feature.
If you are using, say, Windows 7 Ultimate edition you can always turn off Secure Desktop via the Local Security Policy.
But if you are a version of Windows 7 that does not have the Group Policy Editor, like, say, Windows 7 Home Basic or Windows 7 Home Premium, then you can disable it using the Registry Editor.
To do so:
Type regedit in start search and hit Enter to open the Registry Editor and navigate to the following key:
Now in the RHS pane, double click the PromptOnSecureDesktop registry entry, and then change its value from 1 to 0.
Click OK > Exit.
By disabling Secure Desktop, you would be opening your computer to possible security risks & threats, and hence is not advisable !