Turn User Account Control(UAC) on or off in Windows Vista.

User Account Control (UAC) is a feature in Windows Vista, that can help prevent unauthorized changes to your computer. UAC does this by asking you for permission or an administrator password before performing actions that could potentially affect your computer's operation or that change settings that affect other users.

UAC will alert you with one of the following messages:
Windows needs your permission to continue: A Windows function or program that can affect other users of this computer needs your permission to start. Make sure to ensure that it's a function or program you want to run.
A program needs your permission to continue: This will happen when a program that's not part of Windows needs your permission to start. It has a valid digital signature indicating its name and its publisher, which helps to ensure that the program is what it claims to be. Make sure that this is a program that you intended to run.
An unidentified program wants access to your computer: This is caused by a program that your administrator has specifically blocked from running on your computer is trying to run. To run this program, you must have an administrator unblock it.

The main reason to use UAC is to prevent malware and spyware from installing or making changes to your computer without your permission. This comes in handy when you have users who may go to inappropriate websites or download software from the Internet that may be of risk to their computer. If you trust your users or if its just you that will be using your computer and you are confident that you will not be installing anything you shouldn’t then you can turn this feature off.

So, How can disable this feature in windows vista:

Method  1. - Using Control Panel
1. Open Control Panel.
2. Under User Account and Family settings click on the "Add or remove user account".
3. Select oany one user accounts or click on Manage another account for select a user account.

4. In the "Turn User Account Control (UAC) to make your computer more secure" click to Turn User Account Control on or off.

And unselect the "Use User Account Control (UAC) to help protect your computer". Click on the Ok button.
5. You will be prompted to reboot your computer. Do so when ready.
6. In order to re-enable UAC just select the above checkbox and reboot.


Method  2 - Using MSCONFIG.

1. Open Run box or press [Win]+[R] key and write msconfig

2. System Configuration dialog box will be open click on the Tools tab.

3. Select disable UAC key and click on Launch button.

4. A CMD window will open. When the command is done, you can close the window.
5. Close MSCONFIG. You need to reboot the computer for changes to apply.
You can re-enable UAC by selecting the "Enable UAC" line and then clicking on the Launch button.

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