User Account Control (UAC) is a Windows 7 in-built tool that protects your system and alerts you when you are executing some task that requires administrator privileges, however, if you would like to know how to disable UAC from the registry, here is the info:
Users of both Windows XP and Windows 7 may still find it difficult to understand the behaviour of User Account Control (UAC) mechanism used in Windows 7. UAC is a security feature of Windows 7 that informs you when the action that you want to take to undertake requires an elevation of privileges. The list below explains the behavior changes in Windows 7 with UAC enabled when compared to Windows XP.
Don’t discard the security benefits of User Account Control (UAC). UAC is a Windows 7 in-built tool that protects your system but more important, UAC is a security feature that informs you when an action requires elevation of privileges. For more details about UAC go here and here.
Some installations of Windows 7 are set to allow the default user to log in automatically when the computer starts. However, requesting users to enter their login credentials when the computer starts is highly recommended as it is a security measure. Conversely, when the computer is located in physically secure location, automatic logon might be preferred. Remember, that anyone with physical access to the computer can start the system and access your data if user login is set to auto!
UAC is a Windows 7 in-built tool that protects your system. It alerts you when you are executing some task that requires administrator privileges! For example, if you open a word document and a UAC prompt is displayed, then the document may be some sort of malware as it is requesting administrative privileges when in fact it should not!
UAC runs only with user accounts that have administrator privileges while it does not affect normal users. Normal users without admin rights are by default blocked from running elevated tasks. Do not get mislead by this statement, as there are applications that run with elevated permissions even when normal users are logged on. Therefore, UAC is a security-warning tool that makes you aware of the potential risks.