User Account Control's default state is to be enabled. And for a good reason. Under normal circumstances, you'd get a prompt to confirm various actions before they can take place on your computer.

Windows displays a User Account Control (UAC) prompt whenever you attempt to install or run an existing application as an administrator. If you want additional control over your account's ...

A UAC prompt is shown, asking for permission when an application wants to make a system change like changes that affect other user accounts, modifications to Windows system files and folders ...

Inside the text box, type regedit and press Enter to open the Registry. If a UAC prompt appears on the screen, click on the Yes button to give your approval. From the left pane, select the open ...