What do you do when the mouse on your computer screen starts to move around on its own and click on things on your desktop?

Disconnect your computer from the network.
Tell your supervisor

Disconnect your computer from the network and then tell your supervisor. Computers can be controlled remotely, and hackers can access computers by cracking paswords and usernames. If this happens, it is best to disconnect the computer from the network, to prevent access to the rest of the company files and wait until help arrives. If possible - DO NOT TURN OFF THE COMPUTER.