Disabling UAC on a work computer, at least the audio notifications

Your IT dept may take a dim view of changing when UAC is triggered.

To turn the sound off try StartMenu -> Search -> Change system sounds. Then in Program Events change the sound for Windows User Account Control to Sounds: (None). This entry is the last in the Windows group. (None) is at the start of the Sounds: list.

You can use the left arrow on your keyboard to close each group, and then right arrow to re-open the Windows group. Then the End key to go to end of the list, the Windows User Account Control entry should be at the end of the list.