Turning off UAC
Use the following procedure to disable UAC.
To perform the following procedure, you must be able to log on with or provide the credentials of a member of the local Administrators group.
Important Turning off UAC reduces the security of your computer and may expose you to increased risk from malicious software. We do not recommend leaving UAC disabled.
To turn off UAC
Click Start, and then click Control Panel.
In Control Panel, click User Accounts.
In the User Accounts window, click User Accounts.
In the User Accounts tasks window, click Turn User Account Control on or off.
If UAC is currently configured in Admin Approval Mode, the User Account Control message appears. Click Continue.
Clear the Use User Account Control (UAC) to help protect your computer check box, and then click OK.
Click Restart Now to apply the change right away, or click Restart Later, and then close the User Accounts tasks window.
For more details from Microsoft: